| $$ \begin{aligned}2x^2-5x+5+x^2+9& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3x^2-5x+14\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2x^2} -5x+ \color{red}{5} + \color{blue}{x^2} + \color{red}{9} = \color{blue}{3x^2} -5x+ \color{red}{14} $$ |