Answer
$$5x(4x+8)=20x^2+40x$$
Explanation
| $$ \begin{aligned}5x(4x+8)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}20x^2+40x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{5x} $ by $ \left( 4x+8\right) $ $$ \color{blue}{5x} \cdot \left( 4x+8\right) = 20x^2+40x $$ |
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