Answer
$$4+3x^2+8x^3-7x^3+12x^5+6x^2=12x^5+x^3+9x^2+4$$
Explanation
| $$ \begin{aligned}4+3x^2+8x^3-7x^3+12x^5+6x^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12x^5+x^3+9x^2+4\end{aligned} $$ | |
| ① | Combine like terms: $$ 4+ \color{blue}{3x^2} + \color{red}{8x^3} \color{red}{-7x^3} +12x^5+ \color{blue}{6x^2} = 12x^5+ \color{red}{x^3} + \color{blue}{9x^2} +4 $$ |
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