Answer
$$3x^2-3x+9-5x^2-8x-7=-2x^2-11x+2$$
Explanation
| $$ \begin{aligned}3x^2-3x+9-5x^2-8x-7& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2x^2-11x+2\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3x^2} \color{red}{-3x} + \color{green}{9} \color{blue}{-5x^2} \color{red}{-8x} \color{green}{-7} = \color{blue}{-2x^2} \color{red}{-11x} + \color{green}{2} $$ |
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