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Factorisation of Quadratic Polynomials- Middle term splitting

If x2-x-42=x+...

Question

If $x^{2} - x - 42 = (x + k) (x + 6)$ , then the value of $k$ is ____.

A

6

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B

-6

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C

7

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D

-7

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Solution

The correct option is D -7
Given, $x^{2} - x - 42 = (x + k) (x + 6)$

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