| $$ \begin{aligned}3x^2-6x-10-14& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3x^2-6x-24\end{aligned} $$ | |
| ① | Combine like terms: $$ 3x^2-6x \color{blue}{-10} \color{blue}{-14} = 3x^2-6x \color{blue}{-24} $$ |