Combine 9xy^3-4y^4-10x^2y^2+x^3y+3x^4+2x^2y^2-9y^4

$9 x y^{3} - 4 y^{4} - 10 x^{2} y^{2} + x^{3} y + 3 x^{4} + 2 x^{2} y^{2} - 9 y^{4}$

Subtract $9 y^{4}$ from $- 4 y^{4}$ .

$9 x y^{3} - 13 y^{4} - 10 x^{2} y^{2} + x^{3} y + 3 x^{4} + 2 x^{2} y^{2}$

Add $- 10 x^{2} y^{2}$ and $2 x^{2} y^{2}$ .

$9 x y^{3} - 13 y^{4} + x^{3} y + 3 x^{4} - 8 x^{2} y^{2}$

Simplify the expression.

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Move $- 13 y^{4}$ .

$9 x y^{3} + x^{3} y + 3 x^{4} - 8 x^{2} y^{2} - 13 y^{4}$

Move $9 x y^{3}$ .

$x^{3} y + 3 x^{4} - 8 x^{2} y^{2} + 9 x y^{3} - 13 y^{4}$

Reorder $x^{3} y$ and $3 x^{4}$ .

$3 x^{4} + x^{3} y - 8 x^{2} y^{2} + 9 x y^{3} - 13 y^{4}$

Combine 9xy^3-4y^4-10x^2y^2+x^3y+3x^4+2x^2y^2-9y^4

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