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Factor Theorem

If x+bx+a is ...

Question

If (x + b)(x+a) is a factor of the polynomial $x^{2} - 2 x - 15$ . Then value of ab is

A

3

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B

5

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C

15

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D

-15

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Solution

The correct option is D
-15

We know that c is the product of the roots, Hence -15 is the product of the roots.

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