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