$$ \begin{aligned}x^2+17x-3x^2+5x& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2x^2+22x\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{x^2} + \color{red}{17x} \color{blue}{-3x^2} + \color{red}{5x} = \color{blue}{-2x^2} + \color{red}{22x} $$ |