$$ \begin{aligned}-4x^2+3x^2+6xy+2xy& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-x^2+8xy\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{-4x^2} + \color{blue}{3x^2} + \color{red}{6xy} + \color{red}{2xy} = \color{blue}{-x^2} + \color{red}{8xy} $$ |