Answer
$$3x^2+10-7x^2-9x=-4x^2-9x+10$$
Explanation
| $$ \begin{aligned}3x^2+10-7x^2-9x& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-4x^2-9x+10\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3x^2} +10 \color{blue}{-7x^2} -9x = \color{blue}{-4x^2} -9x+10 $$ |
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