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1. $x^{2} + 7 x + 12 = 0$

Answer: Option A

Explanation:

x^{2} + 7 x + 12 = x^{2} + 4 x + 3 x + 12 = x (x + 4) + 3 (x + 4) = (x + 3) (x + 4)

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