Question
Answer
$$20+12x^2-5-10x+4x^2+8x^3+x-7x^3=x^3+16x^2-9x+15$$
Explanation
| $$ \begin{aligned}20+12x^2-5-10x+4x^2+8x^3+x-7x^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^3+16x^2-9x+15\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{20} + \color{red}{12x^2} \color{blue}{-5} \color{green}{-10x} + \color{red}{4x^2} + \color{orange}{8x^3} + \color{green}{x} \color{orange}{-7x^3} = \\ = \color{orange}{x^3} + \color{red}{16x^2} \color{green}{-9x} + \color{blue}{15} $$ |
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