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One of the factor of $x^{2} + 5 x - 66$ is

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x + 5

x + 11

x + 6

x + 7

answer is B.

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Detailed Solution

x^{2} + 5 x - 66

$s u m = 5$ , $\Pr o d u c t = 1 \times (- 66) = - 66$

$x^{2} + 5 x - 66 = x^{2} + 11 x - 5 x - 66$

$= x (x + 11) - 5 (x + 11)$

$= (x + 11) (x - 5)$

$∴$ The factors are $x + 11$ and $x - 5$ .

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