Question

factorize this problem
$3 + 2a - {a}^{2}$
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Answer 1

$- a {}^{2} + 2a + 3 \\ \\ = - a {}^{2} + 3a - 1a + 3 \\ \\ = - a(a - 3) - 1(a - 3) \\ \\ = ( - a - 1)(a - 3)$

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