Answer
$$x+x^2+x^3+x^3+x^8=x^8+2x^3+x^2+x$$
Explanation
| $$ \begin{aligned}x+x^2+x^3+x^3+x^8& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^8+2x^3+x^2+x\end{aligned} $$ | |
| ① | Combine like terms: $$ x+x^2+ \color{blue}{x^3} + \color{blue}{x^3} +x^8 = x^8+ \color{blue}{2x^3} +x^2+x $$ |
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