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Q.

For what value of k, (−4) is a zero of the polynomial x2x − (2k + 2)?

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a

11

b

13

c

6

d

9

answer is D.

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Detailed Solution

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Let p(x) = x2x − (2k + 2).

If (−4) is a zero of p(x), then p (−4) = 0.

p(−4) = 0

(−4)2 − (−4) − 2k − 2 = 0

16 + 4 − 2k − 2 = 0

18 − 2k = 0

2k = 18

k = 9

Thus, the required value of k is 9.

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