Add Polynomials x^2y - 2xy + 9y^2, 7y^2 - xy + x^2y, 2xy + 3x^2y - 5y^2, 4y^2 - 4x^2y + 3xy

Combine and Simplify Polynomials: Solving (4x^2y^3 + 2xy^2 - 2y) - (-7x^2y^3 + 6xy^2 - 2y)

Adding Polynomials: (7x^7y^8 - 5x^5y^5 - 3xy) + (4x^7y^8 - 6x^5y^5 + 4xy)

Simplify the Polynomial Expression (3x^5y^3 - 7x^3y^2 + 11xy) + (-2xy - 4x^5y^3 + 8x^3y^2)

Combine Like Terms and Evaluate Polynomial for x=4, y=-2