Answer
$$3m+2m^2+4m-7m^2=-5m^2+7m$$
Explanation
| $$ \begin{aligned}3m+2m^2+4m-7m^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-5m^2+7m\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3m} + \color{red}{2m^2} + \color{blue}{4m} \color{red}{-7m^2} = \color{red}{-5m^2} + \color{blue}{7m} $$ |
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