| $$ \begin{aligned}2x+7+x^2-5x+3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^2-3x+10\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2x} + \color{red}{7} +x^2 \color{blue}{-5x} + \color{red}{3} = x^2 \color{blue}{-3x} + \color{red}{10} $$ |