Question
Answer
$$-x^3+x^2+290x+288+76x+456-336x-816=-x^3+x^2+30x-72$$
Explanation
| $$ \begin{aligned}-x^3+x^2+290x+288+76x+456-336x-816& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-x^3+x^2+30x-72\end{aligned} $$ | |
| ① | Combine like terms: $$ -x^3+x^2+ \color{blue}{290x} + \color{red}{288} + \color{green}{76x} + \color{orange}{456} \color{green}{-336x} \color{orange}{-816} = -x^3+x^2+ \color{green}{30x} \color{orange}{-72} $$ |
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