Simplify -y^3x-y^2x+y^2+y^3x+y^2

$- y^{3} x - y^{2} x + y^{2} + y^{3} x + y^{2}$

Combine the opposite terms in $- y^{3} x - y^{2} x + y^{2} + y^{3} x + y^{2}$ .

Add $- y^{3} x$ and $y^{3} x$ .

$- y^{2} x + y^{2} + 0 + y^{2}$

Add $- y^{2} x + y^{2}$ and $0$ .

$- y^{2} x + y^{2} + y^{2}$

Add $y^{2}$ and $y^{2}$ .

$- y^{2} x + 2 y^{2}$