Answer
$$2x^2-3x+3+8x^2+x-9=10x^2-2x-6$$
Explanation
| $$ \begin{aligned}2x^2-3x+3+8x^2+x-9& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}10x^2-2x-6\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2x^2} \color{red}{-3x} + \color{green}{3} + \color{blue}{8x^2} + \color{red}{x} \color{green}{-9} = \color{blue}{10x^2} \color{red}{-2x} \color{green}{-6} $$ |
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