just need help with number 2

(b)-3-1+1+3+5+ 7 Express the following in summation notation and use induction to prove for n (a natural number): 1+3+5+ 4(2n-1) = n2 S1=1, Sn= Sn-1 + 2n for all n write a recursive algorithm that computes Sn= 2+4+6+ Give a proof using mathematical induction that your algorithm is 1, 2, 2 +2n correct