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Coordinate Geometry

Question
CBSEENMA9001853
Wired Faculty App

Expand each of the following using suitable identities:
(- 2x + 5y - 3z)2 

Solution

(- 2x + 5y - 3z)2 (-2x + 5y - 3z)2 
={(-2x) + 5y + (- 3z)}2
= (- 2x)2 + (5y)2 + (- 3z)2 + 2(- 2x)(5y) + 2(5y)(- 3z) + 2(- 3z)(- 2x)
= 4x2 + 25y2 + 9z2 - 20xy - 30yz + 12zx

Some More Questions From Coordinate Geometry Chapter

Find the value of n, given (81)5/n = 243.

Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.

4x2 - 3x + 7

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