Question 6: Big-O Estimates

Give as good a big-O estimate as possible for the following complexity functions:

a) f(n) = (nlog n) (n^2 + 2n)

b) f(n) = (2n! + 4n^3 ) + (2^n n^3 )

c) f(n) = n^4 + 5 log n + n^3 (n^2 + 2n)