Question
Answer
$$3m(3m+6)-3m=9m^2+15m$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3m(3m+6)-3m& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9m^2+18m-3m \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}9m^2+15m\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3m} $ by $ \left( 3m+6\right) $ $$ \color{blue}{3m} \cdot \left( 3m+6\right) = 9m^2+18m $$ |
| ② | Combine like terms: $$ 9m^2+ \color{blue}{18m} \color{blue}{-3m} = 9m^2+ \color{blue}{15m} $$ |
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