Answer
$$6m^2n^2-3mn+4mn+13m^2n^2+9=19m^2n^2+mn+9$$
Explanation
| $$ \begin{aligned}6m^2n^2-3mn+4mn+13m^2n^2+9& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}19m^2n^2+mn+9\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{6m^2n^2} \color{red}{-3mn} + \color{red}{4mn} + \color{blue}{13m^2n^2} +9 = \color{blue}{19m^2n^2} + \color{red}{mn} +9 $$ |
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