I'm trying to teach myself induction, I get the idea behind it but theres always some weird jump in algebra at some point that throws me in the examples.
I'm following the example here
The bit that throws me is how they got from:
Doesn't make sense to me how they got rid of the + and the power of 2.
I'm trying to prove the sum of an arithmetic series,
I've proved it for
I'm getting stuck on proving
Closest I've got is:
Which gets rid of an and a on both sides, but everything else I do seems to fail leaving me with unequal amounts of d's and n's on each side.
Anyone got any ideas? thanks