Each of the following expressions represents the number of operations for certain alogrithms. What is the order of each of these experiments?

A.) 5(n^3)+2n+8

B.) [(n^2)+1][3n+5]

Use notation to describe the order of growth. Justify your answers,give proofs for both O and parts.

So i know that the answer for A is (n^3) and the answer for B is also (n^3) but i do not know how to solve the proofs.