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