Use mathematical induction to prove the following:

a factor of (9^n - 8n - 1) is 64 for all n > or = 2

9^1 - 8 - 1 = 64a

64 = 64a

where a = any integer

9^k - 8k - 1 = 64a

prove that 9^(k+1) - 8(k+1) - 1 = 64b; where b = any integer

9(9^k) - 8k - 9

so that's how far i've gotten and now i'm stuck. please help me.