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Yeah, that's where I got it from Not that this is the place to ask, but I'm pretty sure we do. Its not too difficult though :)

Did you? All I see is that you proved that it equals 1 when k=2, not that it is greater than one for all values of k (or n). Your assumption was that the things within the brackets were greater than zero Maybe I'm missing something, running on little sleep :)

I would've done what you did, apart from state that k>=1, therefore 21k - 4 >0, and since 4^k etc >0, LHS is > 0. You seemed to ignore the -4 part :/