I am teaching myself induction proofs and stepping through the algebra for the sample problems. But I got stuck on this part, can't get rid of $(k+1)$.
Can someone please step me through the process (or provide helpful links)? Thank you in advance.
EDIT sorry, my problem is to convert left formula to the right.
EDIT 2 Problem I am looking at (first page), and bellow is the how it is shown on the example.