Answer
$$-5y^2+6y-4y^2-3y+7=-9y^2+3y+7$$
Explanation
| $$ \begin{aligned}-5y^2+6y-4y^2-3y+7& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-9y^2+3y+7\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-5y^2} + \color{red}{6y} \color{blue}{-4y^2} \color{red}{-3y} +7 = \color{blue}{-9y^2} + \color{red}{3y} +7 $$ |
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