Answer
$$4x^3+5x-5x+15+6x^3+6x^2+8x-17=10x^3+6x^2+8x-2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4x^3+5x-5x+15+6x^3+6x^2+8x-17& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4x^3+15+6x^3+6x^2+8x-17 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}10x^3+6x^2+8x-2\end{aligned} $$ | |
| ① | Combine like terms: $$ 4x^3+ \, \color{blue}{ \cancel{5x}} \, \, \color{blue}{ -\cancel{5x}} \,+15 = 4x^3+15 $$ |
| ② | Combine like terms: $$ \color{blue}{4x^3} + \color{red}{15} + \color{blue}{6x^3} +6x^2+8x \color{red}{-17} = \color{blue}{10x^3} +6x^2+8x \color{red}{-2} $$ |
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