Answer
$$6x^2+7x+5-2x^2+9x=4x^2+16x+5$$
Explanation
| $$ \begin{aligned}6x^2+7x+5-2x^2+9x& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4x^2+16x+5\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{6x^2} + \color{red}{7x} +5 \color{blue}{-2x^2} + \color{red}{9x} = \color{blue}{4x^2} + \color{red}{16x} +5 $$ |
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