1+2+3+.....+n<1/8(2n+1)²prove by mathematical induction.

Answer 1

Yippeeee!
This is a two step process 1) show that the left hand side is less than the right hand side when n = 1, then step 2) assume true for n=k and show true for n= k + 1

Answer 2

I'm not able to prove n=k+1