Answer
$$-7x^2+14+2x+10x+7-5x^2=-12x^2+12x+21$$
Explanation
| $$ \begin{aligned}-7x^2+14+2x+10x+7-5x^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-12x^2+12x+21\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-7x^2} + \color{red}{14} + \color{green}{2x} + \color{green}{10x} + \color{red}{7} \color{blue}{-5x^2} = \color{blue}{-12x^2} + \color{green}{12x} + \color{red}{21} $$ |
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