Answer
$$3+3^2-5x-5x^2=-5x^2-5x+12$$
Explanation
| $$ \begin{aligned}3+3^2-5x-5x^2& \xlongequal{ }3+9-5x-5x^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-5x^2-5x+12\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3} + \color{blue}{9} -5x-5x^2 = -5x^2-5x+ \color{blue}{12} $$ |
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