Question

Efetue (5x^4y^2).(-2xy^3)+(7x^2y^3).(-2x^3y^2)+(-20x^5y^5)

Answer 1

-5x^4y^2•2xy^3-7x^2y^3•2x^2y^2-20x^5y^5

(-5•2-7•2-20)x^2•x^2•xy2•y^2•y

-44x^2•x^2•xy^2•y^2•y

-44x^5y^5