MarkFL wrote out the EQUATION nicely.
What you should for n=1 is not correct.
Like I said you have an equation. Compute the lhs for n=1, compute the rhs for n=1 and look at this I got the same results!
Assume for n=k that : lhs with n=k equals the rhs with n=k.
Then show true, possible using the assumption, for n=k+1. Show that the lhs really does equal the rhs when n=k+1.
Please try again. The 1st two steps are simple.