Question

Find the value of the expression 8a-6asquare+9 when a= -2​

Answer 1

Answer:

8(-2)-6(-2)²+9

-16-6×4+9

-16-24+9

-40+9

-31

Answer 2

Answer:

$8a - 6 {a}^{2} + 9 \\ a = - 2 \\ \\ 8 \times ( - 2) - 6 \times {( - 2)}^{2} + 9 \\ \\ = - 16 -24 + 9 \\ \\ = - 16 - 15 \\ \\ = - 31$