Answer
$$4a(5a^2-4)+9a=20a^3-7a$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4a(5a^2-4)+9a& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}20a^3-16a+9a \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}20a^3-7a\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{4a} $ by $ \left( 5a^2-4\right) $ $$ \color{blue}{4a} \cdot \left( 5a^2-4\right) = 20a^3-16a $$ |
| ② | Combine like terms: $$ 20a^3 \color{blue}{-16a} + \color{blue}{9a} = 20a^3 \color{blue}{-7a} $$ |
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