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