Question

multiply:
(8a-8)(9a^2+7a+5)

Answer 1

(8a-8)(9a^2+7a+5)=72a^3+56a^2+40a-72a^2-56a-40=72a^3-16a^2-16a-40

Answer 2

i got 72a^3-72a^2+40a-40

Answer 3

\[ \begin{align}
&&9a^2 + 7a &+ 5 \\
\times &&8a &- 8\\
\hline\\
&&-72a^2-56a &-40\\
&&72a^3+56a^2+40a\\
\hline\\
&&72a^3-16a^2-16a &-40\\
\end{align}\]

Answer 4

thanks