Question

Factorise
1)
$a {}^{2} + 7a + 12$

answer- (a+3)(a+4)​

Answer 1

Explanation:

${a}^{2} + 7a + 12$

$= {a}^{2} + 4a + 3a + 12$

$= a(a + 4) + 3(a + 4)$

$= (a + 4)(a + 3)$

Hence, factorised.

I hope it helps you . If you have any doubts, then don't hesitate to ask.

Answer 2

${a}^{2} + 7a + 12 \\ {a}^{2} + 4a + 3a + 12 \\ a(a + 4) + 3(a + 4) \\ (a + 4)(a + 3)$