Question
Answer
$$4x+3\cdot(3+3x)=13x+9$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4x+3\cdot(3+3x)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4x+9+9x \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}13x+9\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3} $ by $ \left( 3+3x\right) $ $$ \color{blue}{3} \cdot \left( 3+3x\right) = 9+9x $$ |
| ② | Combine like terms: $$ \color{blue}{4x} +9+ \color{blue}{9x} = \color{blue}{13x} +9 $$ |
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