Multiply the Polynomial by the Monomial, and Simplify $-15 x y^{2}\left(y^{3}-2 x y+3 x^{2}-x^{2} y\right)$

Essay

Multiply the polynomial by the monomial, and simplify: $-15 x y^{2}\left(y^{3}-2 x y+3 x^{2}-x^{2} y\right)$