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$x^{2} + 9 x + 20 =$

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(x + 4) (x + 5)

(x - 4) (x - 5)

(x - 4) (x + 5)

(x + 4) (x - 5)

answer is A.

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Detailed Solution

x^{2} + 9 x + 20

$= x^{2} + 5 x + 4 x + 20$

$= x (x + 5) + 4 (x + 5)$

$= (x + 5) (x + 4)$

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