Answer
$$4x^3+5x^2-5x+15+6x^3+6x^2+8x-17=10x^3+11x^2+3x-2$$
Explanation
| $$ \begin{aligned}4x^3+5x^2-5x+15+6x^3+6x^2+8x-17& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}10x^3+11x^2+3x-2\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{4x^3} + \color{red}{5x^2} \color{green}{-5x} + \color{orange}{15} + \color{blue}{6x^3} + \color{red}{6x^2} + \color{green}{8x} \color{orange}{-17} = \\ = \color{blue}{10x^3} + \color{red}{11x^2} + \color{green}{3x} \color{orange}{-2} $$ |
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