Answer:
[tex]\huge\boxed{f(4) = 256}[/tex]
Step-by-step explanation:
Given function is:
[tex]f(x) = 4^x[/tex]
Put x = 4
So,
[tex]f(4) = 4^4\\\\f(4) = 256\\\\\rule[225]{225}{2}[/tex]
Hope this helped!