Answer
$$7x+2x^2-8x+15+4x^3-9x+3=4x^3+2x^2-10x+18$$
Explanation
| $$ \begin{aligned}7x+2x^2-8x+15+4x^3-9x+3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4x^3+2x^2-10x+18\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{7x} +2x^2 \color{red}{-8x} + \color{green}{15} +4x^3 \color{red}{-9x} + \color{green}{3} = 4x^3+2x^2 \color{red}{-10x} + \color{green}{18} $$ |
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