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Coordinate Geometry

Question
CBSEENMA9001775

Find the value of k, if x - 1 is a factor of p(x) in each of the following cases:
p(x) = 2x+ kx + square root of 2

Solution

p(x) = 2x+ kx + square root of 2
If x - 1 is a factor of p(x), then p(1) = 0
                                          | By Factor Theorem
rightwards double arrow space space space space space 2 left parenthesis 1 right parenthesis squared plus straight k left parenthesis 1 right parenthesis space plus space square root of 2 space equals space 0
rightwards double arrow space space space space space 2 plus straight k plus square root of 2 equals 0
rightwards double arrow space space space space space space space space space straight k space equals negative left parenthesis 2 plus square root of 2 right parenthesis.