Multiply These Polynomials, and Simplify $\left(x^{3}+5 x^{2}-3 x+4\right)\left(4 x^{3}-4 x^{2}+x-1\right)$

Essay

Multiply these polynomials, and simplify: $\left(x^{3}+5 x^{2}-3 x+4\right)\left(4 x^{3}-4 x^{2}+x-1\right)$