Answer
$$-8x^2+5x+3+6x+6=-8x^2+11x+9$$
Explanation
| $$ \begin{aligned}-8x^2+5x+3+6x+6& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-8x^2+11x+9\end{aligned} $$ | |
| ① | Combine like terms: $$ -8x^2+ \color{blue}{5x} + \color{red}{3} + \color{blue}{6x} + \color{red}{6} = -8x^2+ \color{blue}{11x} + \color{red}{9} $$ |
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