Hey guys

I'm trying to teach myself about the topic series but can't seem to understand it...

Esp. these questions:

1. (x+1)^3 – x^3 = 3x^2 + 3x^ + 1

∑n^2 =

2. (x+1)^4 – x^4 = 4x^3 + 6x^2 + 4x + 1

∑n^3=

Please, culd u please explain how to do these q.s to me??

Thanx a lot!