One of the factors of $x^{2} - 2 x - 15$ is:

x+3

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x-3

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x+5

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x - 15

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Solution

The correct option is A
x+3

$x^{2} - 2 x - 15 = x^{2} - 5 x + 3 x - 15$

= $x (x - 5) + 3 (x - 5)$

= $(x + 3) (x - 5)$

so, $x + 3$ is one of the factors of the given expression.

Suggest Corrections

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