Answer
$$4a(5a^2-4a-9)=20a^3-16a^2-36a$$
Explanation
| $$ \begin{aligned}4a(5a^2-4a-9)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}20a^3-16a^2-36a\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{4a} $ by $ \left( 5a^2-4a-9\right) $ $$ \color{blue}{4a} \cdot \left( 5a^2-4a-9\right) = 20a^3-16a^2-36a $$ |
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