Answer
$$8x(5x+7)=40x^2+56x$$
Explanation
| $$ \begin{aligned}8x(5x+7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}40x^2+56x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{8x} $ by $ \left( 5x+7\right) $ $$ \color{blue}{8x} \cdot \left( 5x+7\right) = 40x^2+56x $$ |
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