Answer
$$9xy^3-4y^4-10x^2y^2+x^3y+3x^4+2x^2y^2-9y^4=3x^4+x^3y-8x^2y^2+9xy^3-13y^4$$
Explanation
| $$ \begin{aligned}9xy^3-4y^4-10x^2y^2+x^3y+3x^4+2x^2y^2-9y^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3x^4+x^3y-8x^2y^2+9xy^3-13y^4\end{aligned} $$ | |
| ① | Combine like terms: $$ 9xy^3 \color{blue}{-4y^4} \color{red}{-10x^2y^2} +x^3y+3x^4+ \color{red}{2x^2y^2} \color{blue}{-9y^4} = 3x^4+x^3y \color{red}{-8x^2y^2} +9xy^3 \color{blue}{-13y^4} $$ |
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