Answer
$$15x^2-7x^4+25x^3-10x^4+35x^3-5x^4=-22x^4+60x^3+15x^2$$
Explanation
| $$ \begin{aligned}15x^2-7x^4+25x^3-10x^4+35x^3-5x^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-22x^4+60x^3+15x^2\end{aligned} $$ | |
| ① | Combine like terms: $$ 15x^2 \color{blue}{-7x^4} + \color{red}{25x^3} \color{green}{-10x^4} + \color{red}{35x^3} \color{green}{-5x^4} = \color{green}{-22x^4} + \color{red}{60x^3} +15x^2 $$ |
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