Answer
$$3(x+3)a=3ax+9a$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3(x+3)a& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}(3x+9)a \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}3ax+9a\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3} $ by $ \left( x+3\right) $ $$ \color{blue}{3} \cdot \left( x+3\right) = 3x+9 $$ |
| ② | $$ \left( \color{blue}{3x+9}\right) \cdot a = 3ax+9a $$ |
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