Given that r^2 +1 = (r+2)(r+1) - 3(r+1) + 2
Show that Sigma r=1 r=n (r^2 + 1)r! = n(n+1)!
Help please ><
I understand that you're new here, welcome to MHF. Next time, you may want to wrap [tex] tags, so your question will look like this:
Show that .
Anyway, replace with so that our summation becomes
Note that if , all of the terms cancel out, leaving
, this factors to .