Please explain in detail how each is done.

E2. Give a big-O estimate for each of these functions. For the function g in your estimate f(x) is O(g(x)), use a simple function g of smallest order. (3 points) a) (n3+n2logn)(logn+1)+(17logn+19)(n3+2) b) (2n+n2)(n3+3n) c) (nn+n2n+5n)(n!+5n)