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Question

If x2 - 6x - 40 = (x + 4)(x + a) then the value of a is:


A

-10

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B

5

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C

10

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D

-5

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Solution

The correct option is A

-10


x2 - 6x - 40

= x2 - 10x + 4x - 40

= x(x - 10) + 4(x - 10)

= (x + 4)(x - 10)

Thus, a = 4 OR a = -10


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