Answer the problem below using formal definitions of Big-Oh and include the Properties of Big-Oh Notation:
(a) Use the formal de?nition of Big-Oh to prove that if f(n) = √n4 -4n3 + 6n2 -4n + 1 (suppose to be f(n) = square root of (n^4 - 4n^3 + 6n^2 - 4^n + 1), then f(n) = O(n^2).