Question

simplify a(a-7)+12 if a=3​

Answer 1

Answer:

8

HOPE THIS IS HELFULL!

Answer 2

Answer:

0

Step-by-step explanation:

$a(a - 7) + 12 = {a}^{2} - 7a + 12 \\ = 9 - 21 + 12 \\ = 0$

OR

$a(a - 7) + 12 = {a}^{2} - 7a + 12 \\ = {a}^{2} - 4a - 3a + 12 \\ = a(a - 4) - 3(a - 4) \\ = (a - 4)(a - 3) \\ = (3 - 4)(3 - 3) \\ = ( - 1) \times 0 \\ = 0$

Hope it helps!!

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