Multiply the Polynomial by the Monomial, and Simplify $3 a^{2} b\left(a b^{2}-3 a+4 a^{2} b-5 b\right)$

Essay

Multiply the polynomial by the monomial, and simplify: $3 a^{2} b\left(a b^{2}-3 a+4 a^{2} b-5 b\right)$