if f(x)=4^(2x)-1, find :f(1)+f(2)

Question

solution pls

Answer 1

Compute f(1) and f(2) and add them.
Surely you can do this yourself.

The answer wil be 4^2 -1 + 4^4 -1

= 16 -1 + 256 -1 = ___