Hi,

im a bit stuck on an question,

using proof by induction, prove that

sum_(r=1)^n(2 r-1) = n^2

same formula formatted:

http://www.wolframalpha.com/input/?i=Sum[2+r+-+1%2C+{r%2C+1%2C+n}]

my answers keep not making sense. please can someone help