Answer
$$a(3a+7)=3a^2+7a$$
Explanation
| $$ \begin{aligned}a(3a+7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3a^2+7a\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{a} $ by $ \left( 3a+7\right) $ $$ \color{blue}{a} \cdot \left( 3a+7\right) = 3a^2+7a $$ |
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