Question
Answer
$$9m^2-13m-6+12m^2+15m-7=21m^2+2m-13$$
Explanation
| $$ \begin{aligned}9m^2-13m-6+12m^2+15m-7& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}21m^2+2m-13\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{9m^2} \color{red}{-13m} \color{green}{-6} + \color{blue}{12m^2} + \color{red}{15m} \color{green}{-7} = \color{blue}{21m^2} + \color{red}{2m} \color{green}{-13} $$ |
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