Answer
$$9x^2-6x+2-x^2+4x-39=8x^2-2x-37$$
Explanation
| $$ \begin{aligned}9x^2-6x+2-x^2+4x-39& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8x^2-2x-37\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{9x^2} \color{red}{-6x} + \color{green}{2} \color{blue}{-x^2} + \color{red}{4x} \color{green}{-39} = \color{blue}{8x^2} \color{red}{-2x} \color{green}{-37} $$ |
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