गणित Chapter 14 गुणनखंड
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    NCERT Solution For Class 8 गणित गणित

    गुणनखंड Here is the CBSE गणित Chapter 14 for Class 8 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 8 गणित गुणनखंड Chapter 14 NCERT Solutions for Class 8 गणित गुणनखंड Chapter 14 The following is a summary in Hindi and English for the academic year 2021-2022. You can save these solutions to your computer or use the Class 8 गणित.

    Question 1
    CBSEHENMAH8003569

    गुणनखंड कीजिए:
    straight x to the power of 4 minus left parenthesis straight x minus straight z right parenthesis to the power of 4

    Solution
    straight x to the power of 4 minus left parenthesis straight x minus straight z right parenthesis to the power of 4 space equals space left parenthesis straight x squared right parenthesis squared space minus space left square bracket left parenthesis straight x minus straight z right parenthesis squared right square bracket squared
                      equals open square brackets straight x squared plus left parenthesis straight x minus straight z right parenthesis squared close square brackets space open square brackets straight x squared minus left parenthesis straight x minus straight z right parenthesis squared close square brackets
                        equals left square bracket straight x squared plus left parenthesis straight x minus straight z right parenthesis squared right square bracket space open square brackets straight x plus left parenthesis straight x minus straight z right parenthesis right square bracket close square brackets space left square bracket straight x minus left parenthesis straight x minus straight z right parenthesis right square bracket
                       equals open square brackets straight x squared plus left parenthesis straight x minus straight z right parenthesis squared close square brackets space left parenthesis 2 straight x minus straight z right parenthesis thin space left parenthesis straight z right parenthesis
                         equals straight z left parenthesis 2 straight x minus straight z right parenthesis left parenthesis straight x squared plus left parenthesis straight x minus straight z right parenthesis squared right parenthesis
                        
    Question 2
    CBSEHHIMAH8004017

    गुणनखंड कीजिए:
    12x + 36

    Solution

    दिया गया है    12x = 3 cross times 2 cross times 2 cross times straight x space equals space left parenthesis 2 cross times 2 cross times 3 right parenthesis cross times straight x
                       36 = space space space space 2 cross times 2 cross times 3 cross times 3 equals left parenthesis 2 cross times 2 cross times 3 right parenthesis cross times 3
    ∴        12x + 36 = [(2 cross times2 cross times3) cross timesx] + (2 cross times2 cross times3) cross times3
                             = left parenthesis 2 cross times 2 cross times 3 right parenthesis left square bracket straight x plus 3 right square bracket
                             = 12(x+3)

    Question 3
    CBSEHHIMAH8004021

    गुणनखंड कीजिए:
    22y – 33z

    Solution

    दिया गया है,               22y = 2 × 11 × y
                                33z = 3 × 11 × z
    ∴                22y - 33z   = [2 × (11) × y] - [3 × (11) × z]
                                     = (11)[2 × y - 3 × z]
                                     = 11[2y - 3z]














    Question 4
    CBSEHHIMAH8004022

    गुणनखंड कीजिए:
    14pq + 35pqr

    Solution

                14pq = 2 × 7 × p × q = 2 × (7 × p × q)
                             35pqr = 5 × 7 × p × q × r = 5 × (7 × p × q) × r
         ∴          14pq + 35 pqr = 2 × (7 × p × q) + 5 × (7 × p × q) × r
                                       = (7 × p × q)[2 + 5 × r]
                                       = 7pq(2+5r)








     


















    Question 5
    CBSEHHIMAH8004024

    दिए गए पदों में सार्व गुणनखंड ज्ञात कीजिए:
    12x, 36




    Solution

    ∵                    12x = 2 × 2 × 3 × x = (2 × 2 × 3) × x
    और                36 = 2 × 2 × 3 × 3 = (2 × 2 × 3) × 3
                             = 2 × 2 × 3 = 12
    ∴ सार्व गुणनखंड  = 12
           
















    Question 6
    CBSEHHIMAH8004025

    दिए गए पदों में सार्व गुणनखंड ज्ञात कीजिए:
    2y, 22xy




    Solution

    ∵                  2y = 2 × y = (2 × y)
    और              22xy = 2 × 11x × y = (2 × y) × 11x
    ∴ सार्व गुणनखंड  = 2 × y = 2y





     



     

    Question 7
    CBSEHHIMAH8004027

    दिए गए पदों में सार्व गुणनखंड ज्ञात कीजिए:
    14pq,  28 straight p squared straight q squared

    Solution

    ∵                      14pq = 2 × 7 × p × q = (2 × 7 × p × q)
    तथा                   28 space straight p squared straight q squared = 2 × 2 × 7 × p × p × q × q
                                     = (2 × 7 × p × q) × 2 × p × q
    ∴  सार्व गुणनखंड  = (2 × 7 × p × q)
                        = 14pq

    Question 8
    CBSEHHIMAH8004028

    दिए हुए पदों में सार्व गुणनखंड ज्ञात कीजिए:
    2x, 3x2, 4

    Solution

    ∵                                   2x = 1 × 2 × x 
                                       3x2  = 1 × 3 × x × x 
    तथा                                 4  = 1 × 2 × 2 
    ∴      सार्व गुणनखंड = 1



     



    Question 9
    CBSEHHIMAH8004032

    दिए हुए पदों में सार्व गुणनखंड ज्ञात कीजिए:
    6abc,  24ab2,  12a2b

    Solution

     ∵                      6abc = 2 × 3 × a × b × c = (2 × 3 × a × b)× c
                         24ab2 = 2 × 2 × 2 × 3 × a × b × b = (2 × 3 × a × b) × 2 × 2 × b
                     12a2b = 2 × 2 × 3 × a × a × b = (2 × 3 × a × b) × 2 × a
    ∴    सार्व गुणनखंड = 2 × 3 × a × b
                                   = 6ab

    Question 10
    CBSEHHIMAH8004033

    दिए हुए पदों में सार्व गुणनखंड ज्ञात कीजिए:
    16x3,  -4x2, 32x

    Solution

    ∵             16x3 = 2 × 2 × 2 × 2 × x × x × x = (2 × 2 × x) × 2 × 2 × x × x
                   -4x2= -1 × 2 × 2 × x × x = (2 × 2 × x) × (-1) × x
                    32x = 2 × 2 × 2 × 2 × 2 × x = (2 × 2 × x) × 2 × 2 × 2
     ∴       सार्व गुणनखंड = 2 × 2 × x = 4x

    Question 11
    CBSEHHIMAH8004036

    दिए हुए पदों में सार्व गुणनखंड ज्ञात कीजिए:
    10 pq, 20qr, 30rp

    Solution

    ∵                 10pq = 2 × 5 × p × q = (2 × 5) × p × q
                       20qr = 2 × 2 × 5 × q × r = (2 × 5) × 2 × q × r                   
                       30rp = 2 × 3 × 5 × r × p = (2 × 5) × 3 × r × p
    ∴              सार्व गुणनखंड  = 2 × 5 = 10

    Question 12
    CBSEHHIMAH8004040

    दिए हुए पदों में सार्व गुणनखंड ज्ञात कीजिए:
    3x2 y3 , 10x3 y2, 6x2 y2z
















    Solution

    ∵            3x2 y3 = 3 × x × x × y × y × y
                           = (x × x × y × y) × 3 × y
                 10x3 y2 = 2 × 5 × x × x × x × y × y
                             = (x × x × y × y) × 2 × 5 × x
                  6x2 y2z = 2 × 3 × x × x × y × y × z
                             = (x × x × y × y) × 2 × 3 × z

    ∴   सार्व गुणनखंड = (x × x × y × y)                              
                                  = x2 y2

    Question 13
    CBSEHHIMAH8004041

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    7x - 42

    Solution

    ∵                     7x = 7 × x = (7) × x
                          42 = 2 × 7 × 3 = (7) × 2 × 3
    ∴             7x - 42 = 7[(x) - (2 × 3)]
                             = 7[x - 6]

     

    Question 14
    CBSEHHIMAH8004042

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    6p - 12q

    Solution

    ∵                    6p   = 2 × 3 × p = (2) × (3) × p = (2 × 3) × p
                          12q = 2 × 2 × 3 × q = (2) × 2 × (3) × q = (2 × 3) × 2 × q
    ∴               6p - 12q = (2 × 3) [(p) - (2 × q)]
                                 = 6[p - 2q]



    Question 15
    CBSEHHIMAH8004043

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    7a2 + 14a

    Solution

    ∵                        7a2 = 7 × a × a = (7 × a) × a                          
                             14a = 2 × 7 × a = (7 × a) × 2
    ∴              7a2 + 14a = (7 × a)[a+2]
                                 = 7a(a+2)

    Question 16
    CBSEHHIMAH8004044

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    -16z + 20z3

    Solution

    ∵          -16z = (-1) × 2 × 2 × 2 × 2 × z = (2 × 2 × z) × (-1) × 2 x 2
                 20z3 = 2 × 2 × 5 × z × z × z = (2 × 2 × z) × 5 × z × z
    ∴     -16z + 20z3 = (2 × 2 × z) [(-1) × 4 + 5 × z × z]
                           = 4z[-4 + 5z2]


         
     

    Question 17
    CBSEHHIMAH8004045

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    20 l2m + 30 a l m

    Solution

    ∵                 20 l2m = 2 × 2 × 5 × l × l × m = (2 × 5 × l × m) × 2 × l
                      30 alm = 2 × 3 × 5 × a × l × m = (2 × 5 × l × m) × 3 × a
    ∴               20 l2m + 30 alm = (2 × 5 × l × m)[2 × l + 3 × a]
                                     = 10lm[2l + 3a]

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    Question 18
    CBSEHHIMAH8004046

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    5x2y - 15xy2

    Solution

    ∵         5x2y = 5 × x × x x y = (5 × x × y) [x]
              15xy2 = 5 × 3 × x × y × y = (5 × x × y) [3 × y]
    ∴       5x2y - 15xy2 = (5 × x × y) [x - 3 × y]
                              = 5xy(x - 3y)

    Question 19
    CBSEHHIMAH8004047

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    10a2 - 15b2 + 20c2

    Solution

    ∵                   10a2 = 2 × 5 × a × a = (5) [2 × a × a]
                         15b2 = 3 × 5 × b × b = (5) [3 × b × b]
                         20c2 = 2 × 2 × 5 × c × c = (5)[2 × 2 × c × c]
    ∴  10a2 - 15b2 + 20c2 = (5)[2 × a × a - 3b × b + 2 × 2 × c × c]
                                 = 5[2a2 - 3b2 + 4c2]

    Question 20
    CBSEHHIMAH8004048

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    -4a2 + 4 ab - 4 ca

    Solution

    ∵        -4a2 = (-1) × 2 × 2 × a × a = (2 × 2 × a)[(-1) × a]
              4ab  = 2 × 2 × a × b = (2 × 2 × a)[b]
              4ca = 2 × 2 × c × a = (2 × 2 × a)[c]
    ∴   -4a2 + 4ab - 4ca = (2 × 2 × a)[(-1) × a + b - c]
                                = 4a[-a + b - c]

             

    Question 21
    CBSEHHIMAH8004049

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    x2yz + xy2z + xyz2

    Solution

    ∵          x2yz = x × x × y × z = (xyz)[x]
                xy2z = x × y × y × z = (xyz)[y]
                xyz2 = x × y × z × z = (xyz)[z]
    ∴  x2yz + xy2z + xyz2 = (xyz)[x + y + z]
                                  = xyz(x + y + z)

    Question 22
    CBSEHHIMAH8004050

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    ax2 y + bxy2 + cxyz



    Solution

    ∵                   ax2y = a × x × x × y = (x × y)[a × x]
                         bxy2 = b × x × y × y = (x × y)[b × y]
                         cxyz = c × x × y × z = (x × y) [c × z]
    ∴   a x2 y + b x y2 + c x y z = (x × y) [a × x + b × y + c × z] 
                                           = xy[ax + by +cz)






     

    Question 23
    CBSEHHIMAH8004051

    गुणनखंड कीजिए:
    x2 + xy + 8x + 8y

    Solution

    x2 + xy + 8x + 8y = x[x + y] + 8[x + y]
                             = (x + y)(x + 8)

    Question 24
    CBSEHHIMAH8004052

    गुणनखंड कीजिए:
    15xy - 6x + 5y - 2

    Solution

    15xy - 6x + 5y - 2 = 3x[5y-2] + 1[5y-2]
                             = (5y - 2)(3x + 1)

    Question 25
    CBSEHHIMAH8004053

    गुणनखंड कीजिए:
    ax + bx - ay - by

    Solution

    ax + bx - ay - by = x[a + b] + (-y)[a + b]
                            = (x - y)[a+b]

    Question 26
    CBSEHHIMAH8004054

    गुणनखंड कीजिए:
    15pq + 15 + 9q + 25p

    Solution

    15pq + 15 + 9q + 25p = 15 pq + 9q + 25 p + 15
                                  = 3q[5p + 3] + 5[5p +3]
                                  = (5p + 3)[3q + 5]

    Question 27
    CBSEHHIMAH8004055

    गुणनखंड कीजिए:
    z - 7 + 7xy - xyz

    Solution

    पदों का पुनःव्यवस्थित करने पर:
    z - 7 + 7xy - xyz = z - 7 - xyz + 7xy
                            = 1[z - 7] - xy[z - 7]
                            = (z - 7) (1 - xy)

    Question 28
    CBSEHHIMAH8004056

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    a2 + 8a + 16

    Solution

    हमें प्राप्त है,
                 a2 + 8a + 16 = (a)2 + 2(a)(4) + (4)2
                                             = (a+4)2 = (a + 4)(a + 4)
                                      [∵ (a+b)2 = a2+2ab+b2]
    ∴           a2 + 8a + 16 = (a + 4)2 = (a + 4)(a + 4)      

    Question 29
    CBSEHHIMAH8004057

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    p- 10p + 25


    Solution

    हमें प्राप्त है,
                      p2 - 10p + 25 = p2 - 2(p)(5) + (5)2
                                         = (p - 5)2 = (p - 5) (p - 5)
                                       [∵ (a-b)2 = a2-2ab+b2]
    ∴                p2 - 10p + 25 = (p -5)2 = (p - 5)(p - 5)

    Question 30
    CBSEHHIMAH8004058

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    25m2 + 30 m + 9

    Solution

    हमें प्राप्त है,     25m2 + 30 m + 9 = (5m)2 + (2)(5m)(3) + (3)2
                                            = left parenthesis 5 straight m space plus space 3 right parenthesis squared = (5m + 3)(5m + 3)
    ∴               25m2 - 30m + 9 = left parenthesis 5 straight m space plus space 3 right parenthesis squared = (5m + 3)(5m + 3)

    Question 31
    CBSEHHIMAH8004059

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    49 straight y squared space plus space 84 yz space plus space 36 straight z squared

    Solution

    हमें प्राप्त है,           
             49 straight y squared space plus space 84 yz space plus space 36 straight z space squared space equals space left parenthesis 7 straight y right parenthesis squared space plus space 2 left parenthesis 7 straight y right parenthesis left parenthesis 6 straight z right parenthesis space plus space left parenthesis 6 straight z right parenthesis squared
                                        [∵ (a+b)2 = a2+2ab+b2]
                                              = left parenthesis 74 space plus space 6 straight z right parenthesis squared                              
                                              = (7y + 6z)(7y + 6z)
    ∴       49 straight y squared plus 84 yx plus 36 space straight z squared space equals space left parenthesis 7 straight y space plus space 6 straight z right parenthesis squared space equals space left parenthesis 7 straight y space plus space 6 straight z right parenthesis space left parenthesis 7 straight y space plus space 6 straight z right parenthesis

    Question 32
    CBSEHHIMAH8004060

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    4x2 - 8x + 4

    Solution

    हमें प्राप्त है,
    4x2 - 8x + 4 = (2x)2 -2(2x)(2) + (2)2
                             
     [∵ (a-b)2 = a2-2ab+b2]
                     = (2x - 2)2 = (2x -2) (2x - 2)
                     = 2(x - 1)2(x - 1)
                     = 4(x - 1) (x - 1) 
    ∴          4x2 - 8x + 4 = 4(x - 1) (x - 1) = 4(x - 1)2


    Question 33
    CBSEHHIMAH8004061

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    121b2 - 88bc + 16c2

    Solution

    हमें प्राप्त है,
    121b2 - 88bc + 16c2 = (11b)2 - 2(11b)(4c) + (4c)2
                                 [∵ (a-b)2 = a2-2ab+b2]
                                            = (11b - 4c)2 = (11b - 4c)(11b - 4c)
    ∴  121b2 - 88bc + 16c2 = (11b - 4c)2 = (11b - 4c)(11b - 4c)

    Question 34
    CBSEHHIMAH8004068

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    (l+m)2 - 4lm

    Solution

    हमें प्राप्त है,
                    (l + m)2 - 4lm = (l2 + 2lm + m2) - 4lm                                       
                                         = l2 + (2lm - 4lm) + m2
                                         = l2 - 2lm + m2
                                         = left parenthesis straight l right parenthesis squared space minus space 2 left parenthesis straight l right parenthesis left parenthesis straight m right parenthesis space plus space left parenthesis straight m right parenthesis squared
                                        [∵ (a-b)2 = a2-2ab+b2]
                                         = left parenthesis straight l space minus straight m right parenthesis squared space equals space left parenthesis straight l minus straight m right parenthesis space left parenthesis straight l minus straight m right parenthesis
    ∴  left parenthesis straight l plus straight m right parenthesis squared space minus space 4 lm space equals space left parenthesis straight l minus straight m right parenthesis squared space equals space left parenthesis straight l minus straight m right parenthesis left parenthesis straight l minus straight m right parenthesis



    Question 35
    CBSEHHIMAH8004070

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    straight a to the power of 4 space plus space 2 straight a squared straight b squared plus straight b to the power of 4

    Solution

    हमें प्राप्त है,  straight a to the power of 4 plus 2 straight a squared straight b squared plus straight b to the power of 4 equals left parenthesis straight a squared right parenthesis squared plus 2 left parenthesis straight a squared right parenthesis left parenthesis straight b squared right parenthesis plus left parenthesis straight b squared right parenthesis squared
                                         [∵ (a2 + b2) = a2 + 2ab + b2]
                                                  equals left parenthesis straight a squared plus straight b squared right parenthesis squared space equals space left parenthesis straight a squared plus straight b squared right parenthesis left parenthesis straight a squared plus straight b squared right parenthesis
    ∴           straight a to the power of 4 plus 2 straight a squared straight b squared plus straight b squared space equals space left parenthesis straight a squared plus straight b squared right parenthesis squared left parenthesis straight a squared plus straight b squared right parenthesis left parenthesis straight a squared plus straight b squared right parenthesis

    Question 36
    CBSEHHIMAH8004072

    गुणनखंड कीजिए:
    4 straight p squared space minus space 9 straight q squared

    Solution

    ∵          4 straight p squared minus 9 straight q squared space equals space left parenthesis 2 straight p right parenthesis squared space minus space left parenthesis 3 straight q right parenthesis squared
                               = (2p - 3q) (2p + 3q) [∵ space space straight a squared minus straight b squared space equals space left parenthesis straight a plus straight b right parenthesis space left parenthesis straight a minus straight b right parenthesis]
    ∴       4 straight p squared minus 9 straight q squared space equals space left parenthesis 2 straight p minus 3 straight q right parenthesis space left parenthesis 2 straight p plus 3 straight q right parenthesis

    Question 37
    CBSEHHIMAH8004075

    गुणनखंड कीजिए:
    63 straight a squared space minus space 112 straight b squared space


    Solution

    हमें प्राप्त है:
            space space 63 straight a squared minus 112 straight b squared space equals space 7 space cross times space 9 straight a squared space minus space 7 space cross times space 16 straight b squared
                                   = 7 left parenthesis 9 straight a squared minus 16 straight b squared right parenthesis
    ∵        9 straight a squared space minus space 16 straight b squared space space equals space left parenthesis 3 straight a right parenthesis squared space minus space left parenthesis 4 straight b right parenthesis squared
                                 = (3a + 4b) (3a - 4b)  [∵  straight a squared minus straight b squared equals space left parenthesis straight a minus straight b right parenthesis space left parenthesis straight a plus straight b right parenthesis right square bracket
    ∴    space 63 straight a squared minus 112 straight b squared space equals space 7 left square bracket left parenthesis 3 straight a space plus space 4 straight b right parenthesis space left parenthesis 3 straight a minus 4 straight b right parenthesis right square bracket

    Question 38
    CBSEHHIMAH8004077

    गुणनखंड कीजिए:
    49 straight x squared space minus 36

    Solution

    ∵  49 straight x squared space minus 36 space equals space left parenthesis 7 straight x right parenthesis squared space minus space left parenthesis 6 right parenthesis squared
                         = (7x - 6) (7x + 6)   [∵  straight a squared space minus space straight b squared space equals space left parenthesis straight a minus straight b right parenthesis space left parenthesis straight a plus straight b right parenthesis right square bracket
    ∴      49 straight x squared space minus space 36 = (7x - 6)(7x + 6)


                           

    Question 39
    CBSEHHIMAH8004079

    गुणनखंड कीजिए:
    16 straight x to the power of 5 space minus space 144 straight x cubed

    Solution

    हमें प्राप्त हैं  16 straight x to the power of 5 space equals space 16 straight x cubed space cross times space straight x squared  and 144 straight x cubed space equals space 16 straight x cubed space cross times space 9
    ∴     16 straight x to the power of 5 space minus space 144 straight x to the power of 3 space end exponent equals space left parenthesis 16 straight x cubed right parenthesis space cross times space straight x squared space minus space left parenthesis 16 straight x cubed right parenthesis space cross times space 9
                                 = 16 straight x cubed left square bracket straight x squared minus 9 right square bracket
                                 = 16 straight x cubed left square bracket left parenthesis straight x right parenthesis squared space minus space left parenthesis 3 right parenthesis squared right square bracket
                                 = 16 straight x cubed left square bracket left parenthesis straight x plus 3 right parenthesis left parenthesis straight x minus 3 right parenthesis right square bracket  [∵ a2 - b2 = (a-b) (a+b)]
    ∴  16 straight x to the power of 5 space minus space 144 straight x cubed space equals space 16 straight x cubed left parenthesis straight x plus 3 right parenthesis space left parenthesis straight x minus 3 right parenthesis

    Sponsor Area

    Question 40
    CBSEHHIMAH8004080

    गुणनखंड कीजिए:
    (l + m)2 - (l-m)2

    Solution

    (l + m)2 - (l-m)2 = [(l + m) + (l -m)][(l + m) - (l - m)]
                                  [∵ a- b2 = (a+b)(a-b)]
                            = [l + m + l - m][l + m - l + m]
                            = (2l)(2m) = 2cross times 2(l × m)
                            = 4lm    

    Question 41
    CBSEHHIMAH8004081

    गुणनखंड कीजिए:
    9x2y2 - 16

    Solution

    हमें प्राप्त है:
    9x2y2 - 16 = (3xy)2 - (4)2
                   = (3xy + 4)(3xy - 4) [∵ a2 -b2= (a + b)(a - b)]
    ∴  9x2y2 - 16 = (3xy + 4) (3xy - 4)

    Question 42
    CBSEHHIMAH8004082

    गुणनखंड कीजिए:
    (x2 - 2xy + y2) - z2

    Solution

    हमें प्राप्त है,
    (x2 - 2xy + y2) = (x - y)2
    ∴  (x2 - 2xy + y2) - z2 = (x - y)2 - (z)2          
                                            = [(x - y) + z] [(x - y) - z]
                                                    [Using a2 - b2 = (a + b) (a - b)]
                                     = (x - y + z)(x - y - z)
    ∴        (x2 - 2xy + y2) - z2 = (x - y + z) (x - y -z)

    Question 43
    CBSEHHIMAH8004083

    गुणनखंड कीजिए:
    25a2 - 4b2 + 28bc - 49c2

    Solution

    हमें प्राप्त है, -4b2 + 28bc - 49c2 = (-1)[4b2 - 28bc + 49c2]
                                           = -1[(2b)2 - 2(2b)(7c) + (7c)2]
                                           = - [2b - 7c]2
    ∴      25a2 - 4b2 + 28bc - 49c2 = 25a2 - (2b - 7c)2
                                               [∵ a2 -b2 = (a + b) (a - b)]
                  [5a]2 - [2b - 7c]2 = (5a + 2b - 7c)(5a- 2b + 7c)
    ∴   25a2 -4a2 + 28bc - 49c2 = (5a + 2b - 7c)(5a - 2b + 7c)


             

    Question 44
    CBSEHHIMAH8004084

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    ax2 + bx

    Solution

    ∵                  ax2 = a × x × x = (x)[ax]
                        bx = b × x = (x)[b]
    ∴              ax2 + bx = x[ax + b]





    Question 45
    CBSEHHIMAH8004085

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    7p2 + 21q2

    Solution

    हमें प्राप्त है , 7p2 + 21q2= 7 × p × p + 7 × 3 × q × q
                                  = 7[p × p + 3 × q × q]
                                  = 7[p2 + 3q2]

    Question 46
    CBSEHHIMAH8004086
    Question 47
    CBSEHHIMAH8004087

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    am2 + bm2 + bn2 + an2

    Solution

    ∴      am2 + bm2 + bn2 + an2 = m2(a + b) + n2(b + a)
                                             = m2(a + b) + n2 (a + b)
                                              = (a + b)[m2 + n2]

    Question 48
    CBSEHHIMAH8004088

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    (lm + l) + m + 1

    Solution

    हमें प्राप्त है          lm + l = l(m + 1)
    ∴  (lm + l) +  (m + 1) =  l(m + 1) + 1 (m + 1)
                                   = (m + 1) [l +1]

    Question 49
    CBSEHHIMAH8004089

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    y(y + z) + 9(y + z)

    Solution

    (y+z) को उपभयनिष्ठ लेने पर 
    ∴            y(y + z) + 9(y + z) = (y + z)(y + 9)

    Question 50
    CBSEHHIMAH8004091

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    5y2 - 20y - 8z + 2yz

    Solution

    हमें प्राप्त है            5y2 - 20y = 5y(y - 4)
    अथवा                  -8z + 2yz = 2z(-4 + y)
                                         = 2z(y - 4)
    ∴      5y2 - 20y - 8z + 2yz = 5y(y - 4) + 2z(y - 4)
                                        = (y - 4)[5y + 2z]

    Question 51
    CBSEHHIMAH8004092

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    10ab + 4a + 5b + 2

    Solution

    हमें प्राप्त है          10ab + 4a = 2a(5b + 2)
         या                   (5b + 2) = 1(5b + 2)

    ∴       10ab + 4a + 5b + 2 = 2a(5b + 2) + 1 (5b + 2)
                                       = (5b + 2)[2a + 1]

    Question 52
    CBSEHHIMAH8004093

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    6xy - 4y + 6 - 9x

    Solution

     हमें प्राप्त है,      6xy - 4y + 6 - 9x = 6xy - 4y - 9x + 6
                                      = 2y[3x - 2] - 3[3x - 2]
                                      = (3x - 2)(2y - 3)

    Question 53
    CBSEHHIMAH8004095

    गुणनखंड कीजिए: 
    straight a to the power of 4 space minus space straight b to the power of 4

    Solution

    a4 - b4= (a2)2 - (b2)2
                                         [∵ a2 - b2 = (a - b) (a + b)]
    = left parenthesis straight a squared space plus space straight b squared right parenthesis left parenthesis straight a squared space minus space straight b squared right parenthesis

      equals left parenthesis straight a squared space plus space straight b squared right parenthesis left square bracket left parenthesis straight a space plus space straight b right parenthesis space left parenthesis straight a space minus space straight b right parenthesis right square bracket
     = left parenthesis straight a squared space plus space straight b squared right parenthesis (a + b)(a - b)  

    Question 54
    CBSEHHIMAH8004096

    गुणनखंड कीजिए 
    p4 - 81

    Solution

    हमें प्राप्त है   p4 - 81 = (p2)2 - (92)2
                  [∵ a2 - b2 = (a + b)(a - b)]
             (p2)2 - (9)2 = (p2 + 9)(p2 -9)
    या              p2 - 9 = (p)2 - (3)2
                           = (p + 3)(p - 3)
    ∴           p4 - 81 = (p + 3)(p - 3)(p2 + 9)

    Question 55
    CBSEHHIMAH8004100

    गुणनखंड कीजिए:
    x4 - (y + z)4

    Solution

    ∵   x4 - (y + z)4 = [x2]2 - [(y + z)2]2
                           = [(x2) + (y + z)2] [(x2) - (y + z)2
                                                         [∵  a2 - b2 = (a+b)(a-b)]
    हम [x2 - (y + z)2] और भी गुणनखंड कर सकते हैं 
           x2 - (y + z)2 = [(x) + (y + z)][(x) - (y + z)]
                             = (x + y + z)(x - y - z)
    ∴      x4 - (y + z)4 = (x + y + z)(x - y - z)[x2 + (y + z)2]




         

    Question 56
    CBSEHHIMAH8004102

    गुणनखंड कीजिए:
    a4 - 2a2b2 + b4

    Solution

    ∵   a4 - 2a2b2 + b4 = (a2)2 - 2(a2)(b2) + (b2)2
                                                 
    [∵ a2 - 2a2b2 + b2 = (a - b)2]
                                      
    = (a2 - b2)2
                              = [(a2 - b2) (a2 + b2)]
                              = [(a - b) (a + b) (a2 + b2)]
    ∴      a4 - 2a2b2 + b4 = (a - b)(a + b)(a2 + b2)

    Question 57
    CBSEHHIMAH8004109

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    p2 + 6p +8

    Solution

    हमें प्राप्त है, p2+ 6p + 8  = p2 + 6p + 9 - 1
                                   = [(p)2 + 2(p)(3) + 32] - 1
                                   = (p + 3)2 - 12   [∵ a2 + 2ab + b2 = (a + b)2]
                                   = [(p + 3) + 1] [(p + 3) - 1]
                                   = (p + 4)(p + 2)
    ∴        p2 + 6p + 8 = (p + 4)(p + 2)

    Question 58
    CBSEHHIMAH8004110

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    q2 - 10q + 21

    Solution

    हमें प्राप्त है,  q2 - 10q + 21 = q2 - 10q + 25 - 4    [∵   21 = 25 - 4]                                 
                                     = [(q)2 - 2(q)(5) + (5)2] - (2)2                                            
                                              
    = [q - 5]2 - [2]2
                               
               = [(q - 5) + 2][(q - 5) - 2]                                                     
                                                                    [∵ a2 - b2 = (a + b) (a - b)]
                                      = (q - 3) (q - 7)

    Question 59
    CBSEHHIMAH8004111

    निम्नलिखित व्यंजकों के गुणनखंड कीजिए:
    p2 + 6p - 16

    Solution

    p2 + 6p - 16 = p2 + 6p + 9 - 25         [∵   -16 = 9 - 25]
                     = [(p)2 + 2(p)(3) + (3)2] - (5)2
                     = [p + 3]2  - [5) [∵ a2 + 2ab + b2 = (a + b)2]
                     = [p + 3] + 5][(p + 3) - 5]
                                                   [∵ a2 - b2 = (a + b)(a - b)]
                   = (p + 8) (p - 2)

    Question 60
    CBSEHHIMAH8004119

    भाग दीजिए;
    24xy2z3 को 6yzसे

    Solution

    24xy2z divided by 6yz2 = fraction numerator 24 xy squared straight z cubed over denominator 6 yz squared end fraction
                     = fraction numerator 2 cross times 2 cross times 2 cross times 3 cross times straight x cross times straight y cross times straight y cross times straight z cross times straight z cross times straight z over denominator 2 cross times 3 cross times straight y cross times straight z cross times straight z end fraction
                     = fraction numerator 2 cross times 2 cross times straight x cross times straight y cross times straight z over denominator 1 end fraction
    ∴         24xy2x3 divided by 6yz2 = 4xyz

    Question 61
    CBSEHHIMAH8004123

    भाग दीजिए:
    63a2b4c6 को 7a2b2c3

    Solution

    63a2b4c6 divided by 7a2b2c3 = fraction numerator 63 straight a squared straight b to the power of 4 straight c to the power of 6 over denominator 7 straight a squared straight b squared straight c cubed end fraction
                                = space space space fraction numerator space 3 cross times 3 cross times 7 cross times straight a squared cross times straight b to the power of 4 cross times straight c to the power of 6 over denominator 7 cross times straight a squared cross times straight b squared cross times straight c cubed end fraction
                               = 3 space cross times space 3 space cross times space straight a squared over straight a squared space cross times space straight b to the power of 4 over straight b squared space cross times space straight c to the power of 6 over straight c cubed
                               =  9 space cross times space straight a to the power of 2 minus 2 end exponent space cross times space straight b to the power of 4 minus 2 end exponent space cross times space straight c to the power of 6 minus 3 end exponent
                               = 9 × a0 + b2 × c3
                              = 9 × 1 × b2 × c3 = 9b2c3

    ∴        63a2b4c6 को 7a2b2c3 = 9b2c3


    Question 62
    CBSEHHIMAH8004126

    निम्नलिखित विभाजन कीजिए:
    28x4 divided by56x

    Solution

    हमें प्राप्त है,             28x4  divided by56x = fraction numerator 28 straight x to the power of 4 over denominator 56 straight x end fraction
                                            = fraction numerator 2 cross times 2 cross times 7 cross times straight x to the power of 4 over denominator 2 cross times 2 cross times 2 cross times 7 cross times straight x to the power of 1 end fraction
                                            = 1 half space cross times space straight x to the power of 4 minus 1 end exponent space equals space 1 half straight x cubed
    ∴          28x4  divided by  56x = 1 half straight x cubed

    Question 63
    CBSEHHIMAH8004132

    निम्नलिखित विभाजन कीजिए:
    -36y3 divided by9y2

    Solution

    हमें प्राप्त है               -36y3 = (-1) x 2 x 2 x 3 x 3 x y x y x y
    या,                           9y2 = 3 x 3 x y x y

    ∴          -36y3 divided by9y2 = fraction numerator negative 36 straight y cubed over denominator 9 straight y squared end fraction
                                 = fraction numerator left parenthesis negative 1 right parenthesis cross times 2 cross times 2 cross times 3 cross times 3 cross times straight y cross times straight y cross times straight y over denominator 3 cross times 3 cross times straight y cross times straight y end fraction

                                 = fraction numerator left parenthesis negative 1 right parenthesis space cross times space 2 space cross times space 2 space cross times straight y over denominator 1 end fraction space equals space minus 4 straight y
    Question 64
    CBSEHHIMAH8004133

    निम्नलिखित विभाजन कीजिए:
    66pq2r3 divided by11qr2

    Solution

    हमें प्राप्त है        66pq2r3 = 2 × 3 × 11 × p × q × q × r × r × r
    और                    11qr2 = 11 × q × r × r
    ∴          66pq2r3 divided by11qr2 = fraction numerator 66 pq squared straight r cubed over denominator 11 qr squared end fraction

                                       = fraction numerator 2 cross times 3 cross times 11 cross times straight p cross times straight q cross times straight q cross times straight r cross times straight r cross times straight r over denominator 11 cross times straight q cross times straight r cross times straight r end fraction
                                       = fraction numerator 2 cross times 3 cross times straight p cross times straight q cross times straight r over denominator 1 end fraction equals space 6 pqr


    Question 65
    CBSEHHIMAH8004134

    निम्नलिखित विभाजन कीजिए:
    34x3y3z3 divided by 51xy2z3

    Solution

      34 straight x cubed straight y cubed straight z cubed space divided by space 51 xy squared straight z cubed space equals space fraction numerator 34 straight x cubed straight y cubed straight z cubed over denominator 51 xy squared straight z cubed end fraction
                                                = fraction numerator 2 space cross times space 17 over denominator 3 space cross times space 17 end fraction cross times straight x cubed over straight x cross times straight y cubed over straight y squared cross times straight z cubed over straight z cubed
                                                = 2 over 3 space cross times space straight x to the power of 3 minus 1 end exponent space cross times space straight y to the power of 3 minus 2 end exponent space cross times space 3 straight x to the power of 3 minus 3 end exponent
                                                = space 2 over 3 space cross times space straight x squared space cross times space straight y to the power of 1 space cross times space straight z to the power of 0 space end exponent space equals space 2 over 3 space cross times space straight x squared straight y space cross times space 1
                                                = 2 over 3 straight x squared straight y

    Question 66
    CBSEHHIMAH8004137

    निम्नलिखित विभाजन कीजिए:
    12a8b8 divided by(-6a6b4)

    Solution

     हमें प्राप्त है,        12 straight a to the power of 8 straight b to the power of 8 space plus space left parenthesis negative 6 straight a to the power of 6 straight b to the power of 4 right parenthesis space equals space fraction numerator 12 straight a to the power of 8 straight b to the power of 8 over denominator negative 6 straight a to the power of 6 straight b to the power of 4 end fraction
                                           = fraction numerator 2 cross times 2 cross times 3 cross times straight a to the power of 8 space cross times space straight b to the power of 8 over denominator negative 1 space cross times space 2 space cross times space 3 space cross times space straight a to the power of 6 space cross times space straight b to the power of 4 end fraction
                                            = fraction numerator 2 over denominator negative 1 end fraction space cross times space straight a to the power of 8 over straight a to the power of 6 space cross times space straight b to the power of 8 over straight b to the power of 4
                                            = negative 2 space cross times space straight a to the power of 8 minus 6 space end exponent cross times space straight b to the power of 8 minus 4 end exponent space equals space minus 2 space cross times space straight a squared space cross times space straight b to the power of 4
                                            = negative 2 straight a squared straight b to the power of 4
                                                         

    Question 67
    CBSEHHIMAH8004138

    दिए हुए बहुपद को दिए हुए एकपदी से भाग कीजिए:
    left parenthesis 5 straight x squared minus 6 straight x right parenthesis divided by 3 straight x

    Solution

    ∵           (5x2 - 6x) divided by 3x = space space fraction numerator 5 straight x squared minus 6 straight x over denominator 3 straight x end fraction
                                       = fraction numerator straight x left parenthesis 5 straight x minus 6 right parenthesis over denominator 3 straight x end fraction space equals space fraction numerator 5 straight x minus 6 over denominator 3 end fraction
    ∴      (5x2 - 6x) divided by3x = 1 third left parenthesis 5 straight x minus 6 right parenthesis

    Question 68
    CBSEHHIMAH8004139

    दिए हुए बहुपद को दिए हुए एकपदी से भाग कीजिए:
    left parenthesis 3 straight y to the power of 8 space minus space 4 straight y to the power of 6 space plus space 5 straight y to the power of 4 right parenthesis space divided by space straight y to the power of 4

    Solution

    ∵  left parenthesis 3 straight y to the power of 8 space minus space 4 straight y to the power of 6 space plus space 5 straight y to the power of 4 right parenthesis space divided by space straight y to the power of 4 space equals space fraction numerator 3 straight y to the power of 8 minus space 4 straight y to the power of 6 plus 5 straight y to the power of 4 over denominator straight y to the power of 4 end fraction
                                           = fraction numerator straight y to the power of 4 left parenthesis 3 straight y to the power of 4 space minus space 4 straight y squared plus 5 right parenthesis over denominator straight y to the power of 4 end fraction

    ∴      left parenthesis 3 straight y to the power of 8 space minus space 4 straight y to the power of 6 space plus space 5 straight y to the power of 4 right parenthesis space divided by space straight y to the power of 4 space equals space 3 straight y to the power of 4 space minus space 4 straight y squared space plus space 5

    Question 69
    CBSEHHIMAH8004141

    दिए हुए बहुपद को दिए हुए एकपदी से भाग कीजिए:
    8 left parenthesis straight x cubed straight y squared straight z squared space plus space straight x squared straight y cubed straight z squared space plus space straight x squared straight y squared straight z cubed right parenthesis space divided by space 4 straight x squared straight y squared straight z squared

    Solution

    ∵  8 left parenthesis straight x cubed straight y squared straight z squared space plus space straight x squared straight y cubed straight z squared space plus space straight x squared straight y squared straight z cubed right parenthesis space divided by space 4 straight x squared straight y squared straight z squared space
                                        = space fraction numerator 8 left parenthesis straight x cubed straight y squared straight z squared space plus space straight x squared straight y cubed straight z squared plus straight x squared straight y squared straight z cubed right parenthesis over denominator 4 space straight x squared space straight y squared space straight z squared end fraction
                                        = fraction numerator 2 cross times 4 cross times straight x squared straight y squared straight z squared left square bracket straight x space plus space straight y space plus space straight z right square bracket over denominator 4 straight x squared straight y squared straight z squared end fraction
                                        = fraction numerator 2 space cross times space left parenthesis straight x space plus space straight y space plus space straight z right parenthesis over denominator 1 end fraction space equals 2 left parenthesis straight x space plus space straight y space plus space straight z right parenthesis

    ∴     fraction numerator 8 left parenthesis straight x cubed straight y squared straight x squared space plus space straight x squared straight y cubed straight z squared space plus space straight x squared straight y squared straight z cubed over denominator 4 straight x squared straight y squared straight z squared end fraction = 2(x + y + z)

    Question 70
    CBSEHHIMAH8004143

    दिए हुए बहुपद को दिए हुए एकपदी से भाग कीजिए:
    left parenthesis straight x cubed space plus space 2 straight x squared space plus space 3 straight x right parenthesis space divided by space 2 straight x

    Solution

    ∵   left parenthesis straight x cubed space plus space 2 straight x squared space plus space 3 straight x right parenthesis space divided by space 2 straight x space equals space fraction numerator straight x cubed plus 2 straight x squared plus 3 straight x over denominator 2 straight x end fraction
                                            = fraction numerator straight x left parenthesis straight x squared plus 2 straight x plus 3 right parenthesis over denominator 2 straight x end fraction
                                            = 1 half left parenthesis straight x squared space plus space 2 straight x space plus space 3 right parenthesis

    ∴    left parenthesis straight x cubed plus 2 straight x squared plus 3 straight x right parenthesis divided by 2 straight x space equals space 1 half left parenthesis straight x squared plus 2 straight x plus 3 right parenthesis

    Question 71
    CBSEHHIMAH8004144

    दिए हुए बहुपद को दिए हुए एकपदी से भाग कीजिए:
    left parenthesis straight p cubed straight q to the power of 6 space minus space straight p to the power of 6 straight q cubed right parenthesis space divided by space straight p cubed straight q cubed

    Solution

    ∵    left parenthesis straight p cubed straight q to the power of 6 space minus space straight p to the power of 6 straight q cubed right parenthesis space divided by space straight p cubed straight q cubed space equals space fraction numerator straight p cubed straight q to the power of 6 space minus space straight p to the power of 6 straight q cubed over denominator straight p cubed straight q cubed end fraction
                                        equals fraction numerator straight p cubed straight q cubed left square bracket straight q cubed minus straight p cubed right square bracket over denominator straight p cubed straight q cubed end fraction equals fraction numerator straight q cubed minus straight p cubed over denominator 1 end fraction

    ∴  left parenthesis straight p cubed straight q to the power of 6 space minus space straight p to the power of 6 straight q cubed right parenthesis space divided by space straight p cubed straight q cubed space equals space straight q cubed space minus space straight p cubed

    Question 72
    CBSEHHIMAH8004145

    निम्नलिखित विभाजन कीजिए: 
    (10x - 25) divided by 5

    Solution

    ∵                 10x - 25 = 5(2x - 5)

    ∴                    fraction numerator 10 straight x minus 25 over denominator 5 end fraction space equals space fraction numerator 5 left parenthesis 2 straight x minus 5 right parenthesis over denominator 5 end fraction space equals space left parenthesis 2 straight x minus 5 right parenthesis
    अत:     (10x - 25) divided by 5 = 2x - 5

    Question 73
    CBSEHHIMAH8004146

    निम्नलिखित विभाजन कीजिए:
    (10x - 25) divided by (2x - 5)

    Solution

    ∵           10x - 25 = 5(2x - 5)

    ∴           fraction numerator 10 straight x minus 25 over denominator 2 straight x minus 5 end fraction equals fraction numerator 5 left parenthesis 2 straight x minus 5 right parenthesis over denominator left parenthesis 2 straight x minus 5 right parenthesis end fraction equals 5
    अत:  left parenthesis 10 straight x minus 25 right parenthesis space divided by space left parenthesis 2 straight x space minus space 5 right parenthesis = 5

    Question 74
    CBSEHHIMAH8004148

    निम्नलिखित विभाजन कीजिए:
    10y(6y + 21) divided by 5(2y + 7)

    Solution

    ∵                  6y + 21 = 3(2y + 7)

    ∴           fraction numerator 10 straight y left parenthesis 6 straight y space plus space 21 right parenthesis over denominator 5 left parenthesis 2 straight y space plus space 7 right parenthesis end fraction space equals space fraction numerator 10 straight y cross times 3 cross times left parenthesis 2 straight y space plus space 7 right parenthesis over denominator 5 left parenthesis 2 straight y space plus space 7 right parenthesis end fraction
                                        = 2 × y × 3 = 6y
    ∴     10y(6y + 21) divided by5(2y + 7) = 6y


    Question 75
    CBSEHHIMAH8004150

    निम्नलिखित विभाजन कीजिए:
    9 straight x squared straight y squared left parenthesis 3 straight z minus 24 right parenthesis divided by 27 xy left parenthesis straight z minus 8 right parenthesis

    Solution

    ∵             3z - 24 = 3(z-8)

    ∴       space fraction numerator 9 straight x squared straight y squared left parenthesis 3 straight z minus 24 right parenthesis over denominator 27 xy left parenthesis straight z minus 8 right parenthesis end fraction space equals space fraction numerator 3 cross times 3 cross times straight x squared cross times straight y squared cross times 3 cross times left parenthesis 3 straight z minus 8 right parenthesis over denominator 3 cross times 3 cross times 3 cross times straight x cross times straight y cross times left parenthesis 3 straight z minus 8 right parenthesis end fraction
                                       = straight x squared over straight x space cross times space straight y squared over straight y space equals space straight x to the power of 2 minus 1 end exponent space straight y to the power of 2 minus 1 end exponent
                                       = xy

    ∴              space space 9 straight x squared straight y squared left parenthesis 3 straight z minus 24 right parenthesis divided by 27 xy left parenthesis straight z minus 8 right parenthesis space equals space xy

    Question 76
    CBSEHHIMAH8004151

    निम्नलिखित विभाजन कीजिए:
    96abc(3a - 12)(5b - 30) divided by 144(a - 4)(b - 6)

    Solution

    ∵           3a - 12 = 3(a - 4)
                 5b - 30 = 5(b - 6)
                    96 = 2 cross times 2 cross times 2 cross times 2 cross times 2 cross times 3
    और            144 = 2 × 2 × 2 × 2 × 3 × 3

    ∴           fraction numerator 96 abc left parenthesis 3 straight a minus 12 right parenthesis left parenthesis 5 straight b minus 30 right parenthesis over denominator 144 left parenthesis straight a minus 4 right parenthesis left parenthesis straight b minus 6 right parenthesis end fraction
                equals fraction numerator 2 cross times 2 cross times 2 cross times 2 cross times 2 cross times 3 cross times straight a cross times straight b cross times straight c cross times 3 cross times left parenthesis straight a minus 4 right parenthesis cross times 5 cross times left parenthesis straight b minus 6 right parenthesis over denominator 2 cross times 2 cross times 2 cross times 2 cross times 3 cross times 3 cross times left parenthesis straight a minus 4 right parenthesis cross times left parenthesis straight b minus 6 right parenthesis end fraction
                 = 2 × 5 × a × b × c = 10abc
     अत:   96abc (3a - 12)(5b - 36) divided by 144(a - b)(b - 6) = 10abc
     






    Question 77
    CBSEHHIMAH8004152

    निर्देशानुसार भाग दीजिए:
    5(2x + 1)(3x + 5) divided by(2x + 1)

    Solution

    हमें प्राप्त है, 5(2x + 1)(3x + 5) divided by(2x + 1) = fraction numerator 5 left parenthesis 2 straight x space plus space 1 right parenthesis left parenthesis 3 straight x space plus space 5 right parenthesis over denominator left parenthesis 2 straight x space plus 1 right parenthesis end fraction
                                                        = fraction numerator 5 cross times left parenthesis 3 straight x space plus space 5 right parenthesis over denominator 1 end fraction space equals space 5 left parenthesis 3 straight x space plus space 5 right parenthesis
    ∴       5(2x + 1)(3x + 5) divided by(2x + 1) = 5(3x +5)

    Question 78
    CBSEHHIMAH8004153

    निर्देशानुसार भाग दीजिए:
    26xy(x + 5) (y - 4) divided by13x(y - 4)

    Solution

    हमें प्राप्त है, 26xy(x + 5) (y - 4) divided by13x(y - 4) = fraction numerator 26 xy left parenthesis straight x plus 5 right parenthesis left parenthesis straight y minus 4 right parenthesis over denominator 13 straight x left parenthesis straight y minus 4 right parenthesis end fraction
                                                            = fraction numerator 2 cross times straight y left parenthesis straight x plus 5 right parenthesis over denominator 1 end fraction
    ∴       26xy(x + 5) (y - 4) divided by13x(y - 4) = 2y(x + 5)

    Question 79
    CBSEHHIMAH8004154

    निर्देशानुसार भाग दीजिए:
    52pqr (p + q)(q + r)(r + p) divided by 104pq(q + r)(r + p)

    Solution

    हमें प्राप्त है,  fraction numerator 52 pqr space left parenthesis straight p plus straight q right parenthesis space left parenthesis straight q plus straight r right parenthesis space left parenthesis straight r plus straight p right parenthesis over denominator 104 pq space left parenthesis straight q plus straight r right parenthesis left parenthesis straight r plus straight p right parenthesis end fraction
                 = fraction numerator 52 cross times straight p cross times straight q cross times straight r cross times left parenthesis straight p plus straight q right parenthesis left parenthesis straight q plus straight r right parenthesis left parenthesis straight r plus straight p right parenthesis over denominator 2 cross times 52 cross times straight p cross times straight q space left parenthesis straight q plus straight r right parenthesis left parenthesis straight r plus straight p right parenthesis end fraction space equals space fraction numerator straight r cross times left parenthesis straight p plus straight q right parenthesis over denominator 2 end fraction
    ∴         52pqr(p + q)(q + r)(r + p) divided by104pq(q + r)(r + p) = 1 half straight r left parenthesis straight p plus straight q right parenthesis

    Sponsor Area

    Question 80
    CBSEHHIMAH8004155

    निर्देशानुसार भाग दीजिए:
    20 left parenthesis straight y plus 4 right parenthesis space left parenthesis straight y squared plus 5 straight y plus 3 right parenthesis divided by space 5 left parenthesis straight y plus 4 right parenthesis

    Solution

    ∵      20 = 2 × 2 × 5

    ∴      fraction numerator 20 left parenthesis straight y space plus space 4 right parenthesis left parenthesis straight y squared space plus space 5 straight y space plus 3 right parenthesis over denominator 5 left parenthesis straight y space plus space 4 right parenthesis end fraction space equals space fraction numerator 2 cross times 2 cross times 5 cross times left parenthesis straight y plus 4 right parenthesis left parenthesis straight y squared plus 5 straight y plus 3 right parenthesis over denominator 5 space cross times space left parenthesis straight y space plus space 4 right parenthesis end fraction
                                = 2 × 2 × (y2 + 5y + 3) = 4(y2 + 5y + 3)



    Question 81
    CBSEHHIMAH8004157

    निर्देशानुसार भाग दीजिए:
    x(x + 1) (x + 2) (x + 3) divided by x(x + 1)

    Solution

    x(x + 1)(x + 2)(x + 3) divided byx(x + 1)
    हमें प्राप्त है,   fraction numerator straight x left parenthesis straight x plus 1 right parenthesis left parenthesis straight x plus 2 right parenthesis left parenthesis straight x plus 3 right parenthesis over denominator straight x left parenthesis straight x plus 1 right parenthesis end fraction equals space fraction numerator left parenthesis straight x plus 2 right parenthesis left parenthesis straight x plus 3 right parenthesis over denominator 1 end fraction
    ∴     x(x+1)(x+2)(x+3) divided byx(x + 1) = (x + 2)(x + 3)

    Question 82
    CBSEHHIMAH8004158

    व्यंजक के गुणनखंड कीजिए और निर्देशानुसार भाग दीजिए:
    left parenthesis straight y squared plus 7 straight y plus 10 right parenthesis space divided by space left parenthesis straight y space plus space 5 right parenthesis

    Solution

    ∵           straight y squared plus 7 straight y plus 10 space equals space straight y squared plus 2 straight y plus 5 straight y plus 10
                                 = y(y + 2) + 5(y + 2)
                                    = (y + 2)(y + 5)
    ∴         fraction numerator straight y squared plus 7 straight y plus 10 over denominator left parenthesis straight y plus 5 right parenthesis end fraction equals fraction numerator left parenthesis straight y plus 2 right parenthesis left parenthesis straight y plus 5 right parenthesis over denominator left parenthesis straight y plus 5 right parenthesis end fraction equals straight y plus 2
    ∴     left parenthesis straight y squared space plus space 7 straight y space plus 10 right parenthesis space divided by left parenthesis straight y space plus space 5 right parenthesis = y + 2


    Question 83
    CBSEHHIMAH8004160

    व्यंजक के गुणनखंड कीजिए और निर्देशानुसार भाग दीजिए:
    left parenthesis straight m squared space minus space 14 straight m space minus space 32 right parenthesis space divided by space left parenthesis straight m space plus space 2 right parenthesis

    Solution

    ∵      m2 -14m - 32 = (m2 - 16m + 2m - 32]   [∵  -14 = -16 + 2]
                               = m(m - 16) + 2(m - 16)       [16 × 2 = 32]
                               = (m - 16)(m + 2)
    ∴  fraction numerator straight m squared minus 14 straight m minus 32 over denominator straight m plus 32 end fraction equals fraction numerator left parenthesis straight m minus 16 right parenthesis left parenthesis straight m plus 2 right parenthesis over denominator left parenthesis straight m plus 2 right parenthesis end fraction equals fraction numerator straight m minus 16 over denominator 1 end fraction
    अत:   left parenthesis straight m squared space minus space 14 straight m space minus space 32 right parenthesis space divided by space left parenthesis straight m space plus space 2 right parenthesis space equals straight m space minus 16


    Question 84
    CBSEHHIMAH8004162

    व्यंजक के गुणनखंड कीजिए और निर्देशानुसार भाग दीजिए:
    (5p2 - 25p + 20) divided by (p - 1)


    Solution

    ∵      5p2 - 25p + 20 = 5(p2 - 5p + 4)               [∵ 1 × 4 = 4]
                                = 5[p(p - 1) - 4(p - 1)]   [-1 + (-4) = -5]
                                = 5[(p - 1)(p - 4)]
    ∴     fraction numerator 5 straight p squared minus 25 straight p plus 20 over denominator straight p minus 1 end fraction space equals space fraction numerator 5 left parenthesis straight p minus 1 right parenthesis left parenthesis straight p minus 4 right parenthesis over denominator left parenthesis straight p minus 1 right parenthesis end fraction space equals space fraction numerator 5 cross times left parenthesis straight p space minus 4 right parenthesis over denominator 1 end fraction
    अत: (5p2 - 25p + 20) divided by(p - 1) = 5(p-4)

    Question 85
    CBSEHHIMAH8004164

    व्यंजक के गुणनखंड कीजिए और निर्देशानुसार भाग दीजिए:
    4yz(z2 + 6z - 16) divided by 2y(z + 8)

    Solution

    ∵             z2 + 6z -16 = z2 + 8z - 2z - 16               ∵ 8 - 2 = 6
                                   = z(z + 8) - 2(z + 8)        ∵ 8 × 2 = 16
                                   = (z + 8)(z - 2)
    ∴       fraction numerator 4 yz left parenthesis straight z squared plus 6 straight z minus 16 right parenthesis over denominator 2 straight y left parenthesis straight z plus 8 right parenthesis end fraction space equals space fraction numerator 2 cross times 2 cross times straight y cross times straight z cross times left parenthesis straight z plus 8 right parenthesis cross times left parenthesis straight z minus 2 right parenthesis over denominator 2 cross times straight y cross times left parenthesis straight z plus 8 right parenthesis end fraction

                                         = fraction numerator 2 cross times straight z cross times left parenthesis straight z plus 2 right parenthesis over denominator 1 end fraction space equals space 2 straight z left parenthesis straight z minus 2 right parenthesis
    अत:    4 yz space left parenthesis straight z squared space plus space 6 straight z space minus space 16 right parenthesis space divided by space 2 straight y left parenthesis straight z space plus space 8 right parenthesis space equals space 2 straight z left parenthesis straight z minus 2 right parenthesis

    Question 86
    CBSEHHIMAH8004165

    व्यंजक के गुणनखंड कीजिए और निर्देशानुसार भाग दीजिए:
    5pq(p2 - q2) divided by2p(p + q)

    Solution

    ∵                p2 - q2 = (p - q) (p + q)
                                               [∵ a2 - b2 = (a + b)(a - b)]

    ∴       fraction numerator 5 pq left parenthesis straight p squared minus straight q squared right parenthesis over denominator 2 straight p left parenthesis straight p plus straight q right parenthesis end fraction equals fraction numerator 5 pq left parenthesis straight p minus straight q right parenthesis left parenthesis straight p plus straight q right parenthesis over denominator 2 straight p left parenthesis straight p plus straight q right parenthesis end fraction equals fraction numerator 5 straight q left parenthesis straight p minus straight q right parenthesis over denominator 2 end fraction
     अत:         5 pq left parenthesis straight p squared minus straight q squared right parenthesis plus 2 straight p left parenthesis straight p plus straight q right parenthesis space equals space 5 over 2 straight q left parenthesis straight p minus straight q right parenthesis.

    Question 87
    CBSEHHIMAH8004166

    व्यंजक के गुणनखंड कीजिए और निर्देशानुसार भाग दीजिए:
    12xy(9x2 - 16y2) divided by4xy(3x + 4y)

    Solution

    ∵     9x2 - 16y2 = (3x)2 - (4y)2
                          = (3x - 4y)(3x + 4y)

    fraction numerator 12 xy left parenthesis 9 straight x squared minus 16 straight y squared right parenthesis over denominator 4 xy left parenthesis 3 straight x plus 4 straight y right parenthesis end fraction equals fraction numerator 2 cross times 2 cross times 3 cross times straight x cross times straight y cross times left parenthesis 3 straight x minus 4 straight y right parenthesis cross times left parenthesis 3 straight x plus 4 straight y right parenthesis over denominator 2 cross times 2 cross times straight x cross times straight y cross times left parenthesis 3 straight x plus 4 straight y right parenthesis end fraction
                                  equals space fraction numerator 3 cross times left parenthesis 3 straight x space minus space 4 straight y right parenthesis over denominator 1 end fraction
    ∴   12 xy left parenthesis 9 straight x squared space minus space 16 straight y squared right parenthesis space divided by space 4 xy left parenthesis 3 straight x space plus space 4 straight y right parenthesis space equals space 3 left parenthesis 3 straight x space minus space 4 straight y right parenthesis

    Question 88
    CBSEHHIMAH8004168

    व्यंजक के गुणनखंड कीजिए और निर्देशानुसार भाग दीजिए:
    39y3(50y2 - 98) divided by26y2(5y + 7)

    Solution

    ∵             50y2 - 98 = 2(25y2 - 49)
                                = 2[(5y)2 - (7)2]
                                =2[(5y - 7)(5y + 7)]

    ∴      fraction numerator 39 straight y cubed left parenthesis 50 straight y squared minus 98 right parenthesis over denominator 26 straight y squared left parenthesis 5 straight y space plus space 7 right parenthesis end fraction space equals space fraction numerator 3 cross times 13 cross times straight y cross times straight y cross times straight y cross times 2 cross times left parenthesis 5 straight y minus 7 right parenthesis cross times left parenthesis 5 straight y plus 7 right parenthesis over denominator 2 cross times 13 cross times straight y cross times straight y cross times left parenthesis 5 straight y space plus space 7 right parenthesis end fraction
                                       = fraction numerator 3 cross times straight y cross times left parenthesis 5 straight y minus 7 right parenthesis over denominator 1 end fraction
    अत:  39y3(50y2 - 98) divided by 26y2(5y + 7) = 3y(5y - 7)

    Question 89
    CBSEHHIMAH8004169

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए: 
    4(x - 5) = 4x - 5

    Solution

    बायाँ पक्ष  = 4(x - 5) = 4 x (x) - 4 x (5) = 4x - 20
    ∴   दायाँ पक्ष होना चाहिए  = 4x - 20.
    अत:    4(x - 5) = 4x - 20 सही कथन है। 

    Question 90
    CBSEHHIMAH8004170

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए: 
    x(3x + 2) = 3x2 + 2

    Solution
    बायाँ पक्ष  = x(3x + 2) = (x) x (3x) + (x) x 2
               = 3x2 + 2x
    ∴   दायाँ पक्ष होना चाहिए  = 3x2 + 2x.
    अत: x(3x + 2) = 3x2 + 2x सही कथन है। 
    Question 91
    CBSEHHIMAH8004171

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    2x + 3y = 5xy

    Solution

    कथन 2x + 3y = 5xy गलत कथन है। ऐसे पदों को केवल साथ में समूहित किया जा सकता है। अत: 2x + 3y = 2x + 3y सत्य कथन है।

    Question 92
    CBSEHHIMAH8004172

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    x + 2x + 3x = 5x

    Solution

    योग पर गुणन की वितरणशील राशि का प्रयोग करने पर, हमें प्राप्त है
    x + 2x + 3x = (1 + 2 + 3)x = 6x
    इस प्रकार,  straight x plus 2 straight x plus 3 straight x space not equal to space 5 straight x comma लेकिन x+2x+3x = 6x सत्य कथन है।

    Question 93
    CBSEHHIMAH8004173

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    5y + 2y + y - 7y = 0

    Solution
    योग पर गुणन की वितरणशील राशि का प्रयोग करने पर, हमें प्राप्त है:
    5y + 2y + y - 7y = (5 + 2 + 1 - 7)y = (8 - 7)y = y
    इस प्रकार,  5 straight y plus 2 straight y plus straight y minus 7 not equal to 0 लेकिन 5y + 2y + y - 7y = y सत्य कथन है।

    Question 94
    CBSEHHIMAH8004174

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    3x + 2x = 5x2

    Solution
    योग पर गुणन की वितरणशील राशि का प्रयोग करने पर, हमें प्राप्त है:
    3x + 2x = (3+2)x = 5x
    3 straight x plus 2 straight x not equal to 5 straight x squared comma लेकिन 3x+2x = 5x सत्य कथन है।
    Question 95
    CBSEHHIMAH8004175

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    left parenthesis 2 straight x right parenthesis squared space plus space 4 left parenthesis 2 straight x right parenthesis space plus space 7 space equals space 2 straight x squared space plus space 8 straight x space plus space 7

    Solution

    बायाँ पक्ष  =  left parenthesis 2 straight x right parenthesis squared plus 4 left parenthesis 2 straight x right parenthesis plus 7
                equals space 2 straight x space cross times space 2 straight x space plus space 4 space cross times space 2 straight x space plus space 7 
                 equals 4 straight x squared plus 8 straight x plus 7
    इस प्रकार,  left parenthesis 2 straight x right parenthesis squared plus 4 left parenthesis 2 straight x right parenthesis plus 7 space not equal to space 2 straight x squared plus 8 straight x plus 7 comma लेकिन
      left parenthesis 2 straight x right parenthesis squared plus space 4 left parenthesis 2 straight x right parenthesis space plus space 7 space equals space 4 straight x squared plus 8 straight x plus 7 सही कथन है।

    Question 96
    CBSEHHIMAH8004176

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    left parenthesis 2 straight x right parenthesis squared space plus space 5 straight x space equals space 4 straight x space plus space 5 straight x space equals space 9 straight x

    Solution

    चूँकि     left parenthesis 2 straight x right parenthesis squared equals space 2 straight x space cross times space 2 straight x space equals space 4 straight x squared
    ∴            left parenthesis 2 straight x right parenthesis squared plus 5 straight x space equals space 4 straight x squared plus 5 straight x
    इस प्रकार,  left parenthesis 2 straight x right parenthesis squared plus 5 straight x space not equal to space 4 straight x plus 5 straight x लेकिन,
                  left parenthesis 2 straight x right parenthesis squared plus 5 straight x space equals space 4 straight x squared plus 5 straight x
    साथ ही,     4 straight x squared plus 5 straight x not equal to 9 straight x
                 

    Question 97
    CBSEHHIMAH8004177

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    left parenthesis 3 straight x plus 2 right parenthesis squared space equals space 3 straight x squared plus 6 straight x plus 4

    Solution

    बायाँ पक्ष equals left parenthesis 3 straight x plus 2 right parenthesis squared space equals space left parenthesis 3 straight x right parenthesis squared plus 2 cross times 3 straight x cross times 2 plus 2 squared 
                               equals 9 straight x squared plus 12 straight x plus 4
    इस प्रकार,  left parenthesis 3 straight x plus 2 right parenthesis squared space not equal to space 3 straight x squared plus 6 straight x plus 4 comma लेकिन 
    left parenthesis 3 straight x plus 2 right parenthesis squared space equals space 9 straight x squared plus 12 straight x plus 4 सही कथन है। 

    Question 98
    CBSEHHIMAH8004178

    x = -3 प्रतिस्थापित करने पर प्राप्त होता है।
    straight x squared minus 5 straight x plus 4 से  left parenthesis negative 3 right parenthesis squared plus 5 left parenthesis negative 3 right parenthesis plus 4 space equals space 9 plus 2 plus 4 space equals space 15 प्राप्त होता है।

    Solution

    स्थान परिवर्तन x = -3 में,  straight x squared plus 5 straight x plus 4, हमें प्राप्त है
             straight x squared plus 5 straight x plus 4 space equals space left parenthesis negative 3 right parenthesis squared plus 5 left parenthesis negative 3 right parenthesis plus 4
                            equals negative 3 space cross times negative 3 space plus 5 space cross times negative 3 space plus 4
equals 9 minus 15 plus 4 space equals space 13 minus 15 space equals space minus 2
    इस प्रकार, x = -3 के लिए,   straight x squared plus 5 straight x plus 4 not equal to 15 comma लेकिन यह समतुल्य है -2 के।

    Question 99
    CBSEHHIMAH8004179

    x = -3 प्रतिस्थापित करने पर प्राप्त होता है।
    straight x squared minus 5 straight x plus 4 से  left parenthesis negative 3 right parenthesis squared minus 5 left parenthesis negative 3 right parenthesis plus 4 space equals space 9 minus 15 plus 4 space equals space minus 2 प्राप्त होता है। 

    Solution
    स्थान परिवर्तन x = -3 में,  straight x squared minus 5 straight x plus 4 comma हमें प्राप्त है
    straight x squared minus 5 straight x plus 4 space equals space left parenthesis negative 3 right parenthesis squared minus 5 left parenthesis negative 3 right parenthesis plus 4
                    equals negative 3 cross times negative 3 minus 5 cross times negative 3 plus 4
equals 9 plus 15 plus 4 space equals space 28
                 
    इस प्रकार, x = -3 के लिए,   straight x squared minus 5 straight x plus 4 not equal to 2 comma लेकिन यह समतुल्य है 28 के।
    Question 100
    CBSEHHIMAH8004180

    x = -3 प्रतिस्थापित करने पर प्राप्त होता है।
    straight x squared plus 5 straight x से  left parenthesis negative 3 right parenthesis squared plus 5 left parenthesis negative 3 right parenthesis equals negative 9 minus 15 space equals space minus 24 प्राप्त प्राप्त है।

    Solution

    स्थान परिवर्तन x = -3 में,  straight x squared plus 5 straight x comma हमें प्राप्त है 
                   straight x squared plus 5 straight x space equals space left parenthesis negative 3 right parenthesis squared plus 5 left parenthesis negative 3 right parenthesis
                     = 9 - 15 = -6
    इस प्रकार,  x = -3  के लिए,  straight x squared plus 5 straight x not equal to negative 24 comma लेकिन यह समतुल्य है  -6 के। 

    Question 101
    CBSEHHIMAH8004181

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    (y - 3)2 = y2 - 9

    Solution

    बायाँ पक्ष  = (y - 3)2
                equals straight y squared minus 2 cross times straight y cross times 3 plus left parenthesis negative 3 right parenthesis squared
equals straight y squared minus 6 straight y plus 9
    इस प्रकार,   left parenthesis straight y minus 3 right parenthesis squared space not equal to space straight y squared minus 9. लेकिन (y - 3)2
                  equals straight y squared minus 6 straight y plus 9 सत्य कथन है।

    Question 102
    CBSEHHIMAH8004182

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    (z + 5)2 = z2 + 25

    Solution

    बायाँ पक्ष  = (z + 5)2
                       
    [∵ (a + b)2 = a2 + 2ab + b2]

                   equals straight z squared plus 2 cross times straight z cross times 5 plus 5 squared
                   
    straight z squared plus 10 straight z plus 25
    इस प्रकार,   left parenthesis straight z plus 5 right parenthesis not equal to straight z squared plus 25 comma लेकिन  left parenthesis straight z plus 5 right parenthesis squared
                    equals straight z squared plus 10 straight z plus 25 सत्य कथन है।

    Question 103
    CBSEHHIMAH8004183

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    (2a + 3b) (a - b) = 2a2 - 3b2

    Solution

    बायाँ पक्ष = (2a + 3b)(a - b)
              = 2a(a - b) + 3b(a - b)
              = 2a x a - 2a x b + 3b x a - 3b x b
              = 2a2 - 2ab + 3ab - 3b2
              = 2a2 + ab - 3b2
    इस प्रकार, left parenthesis 2 straight a plus 3 straight b right parenthesis thin space left parenthesis straight a minus straight b right parenthesis space not equal to space 2 straight a squared minus 3 straight b squared comma लेकिन (2a + 3b)(a - b) = 2a2 + ab - 3b2 सत्य कथन है  

    Question 104
    CBSEHHIMAH8004184

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    (a + 4) (a + 2) = a2 + 8

    Solution

    बायाँ पक्ष = (a + 4) (a + 2) 
              = a2 + (4 + 2)a + 4 x 2
              = a2 + 6a + 8
    इस प्रकार,  left parenthesis straight a plus 4 right parenthesis thin space left parenthesis straight a plus 2 right parenthesis space not equal to space straight a squared plus 8 comma लेकिन (a + 4) (a + 2)  = a2 + 6a + 8 सत्य कथन है। 

    Question 105
    CBSEHHIMAH8004186

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    (a - 4) (a -2) = a2 - 8

    Solution

    बायाँ पक्ष  = (a - 4) (a -2)
                equals straight a squared minus left parenthesis 4 plus 2 right parenthesis straight a plus left parenthesis negative 4 cross times negative 2 right parenthesis
equals straight a squared minus 6 straight a plus 8
    इस प्रकार,  left parenthesis straight a minus 4 right parenthesis thin space left parenthesis straight a minus 2 right parenthesis space not equal to space straight a squared minus 8 comma लेकिन  left parenthesis straight a minus 4 right parenthesis left parenthesis straight a minus 2 right parenthesis space equals space straight a squared minus 6 straight a plus 8 सत्य कथन है।

    Question 106
    CBSEHHIMAH8004188

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    fraction numerator 3 straight x squared over denominator 3 straight x squared end fraction space equals space 0

    Solution

    बायाँ पक्ष  =  fraction numerator 3 straight x squared over denominator 3 straight x squared end fraction equals 1
    इस प्रकार,   fraction numerator 3 straight x squared over denominator 3 straight x squared end fraction not equal to 0 comma  लेकिन  fraction numerator 3 straight x squared over denominator 3 straight x squared end fraction space space equals space 1 सत्य कथन है।

    Question 107
    CBSEHHIMAH8004190

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    fraction numerator 3 straight x squared plus 1 over denominator 3 straight x squared end fraction space equals space 1 space plus space 1 space equals space 2


    Solution

    स्पष्ट है,  fraction numerator 3 straight x squared plus 1 over denominator 3 straight x squared end fraction not equal to 1 plus 1 not equal to 2
    लेकिन,   fraction numerator 3 straight x squared plus 1 over denominator 3 straight x squared end fraction  equals fraction numerator 3 straight x squared over denominator 3 straight x squared end fraction plus fraction numerator 1 over denominator 3 straight x squared end fraction space equals space 1 plus fraction numerator 1 over denominator 3 straight x squared end fraction
    सत्य कथन है। 
     

    Question 108
    CBSEHHIMAH8004191
    Question 109
    CBSEHHIMAH8004192

    निम्नलिखित गणितीय कथनों में त्रुटि ज्ञात करके उसे सही कीजिए:
    fraction numerator 3 over denominator 4 straight x plus 3 end fraction space equals space fraction numerator 1 over denominator 4 straight x end fraction






    Solution

    स्पष्ट हैं,   fraction numerator 3 over denominator 4 straight x plus 3 end fraction not equal to fraction numerator 1 over denominator 4 straight x end fraction
    लेकिन   fraction numerator 3 over denominator 4 straight x plus 3 end fraction space equals space fraction numerator 3 over denominator 4 straight x plus 3 end fraction सत्य कथन है।

    Question 110
    CBSEHHIMAH8004194
    Question 111
    CBSEHHIMAH8004195

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