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so the beginning process would be 2+6+12+20.........+n(n+1)=n(n+1)(n+2)/3

after the equation is proven for n=1 [(1(1+1)=1(1+1)(1+2)/3] then we must prove for n=n+1

thats where i begin to stop understanding.

So...

2+6+12+20......+n(n+1)+n+1(n+1+1)??= n(n+1)(n+2)/3+n+1??

if my nonsense is correct then we are attempting to prove that n(n+1)(n+2)/3+n+1=(n+1)(n+2)

....help