Given f (x) = 4^x + 5, evaluate the function for f (2).
A. f (2)= 11
B. f (2)= 21
C. f (2) = 13
D. f (2)= 16
To evaluate the function f(x) for f(2), we substitute 2 for x in the function.
f(2) = 4^2 + 5
f(2) = 16 + 5
f(2) = 21
Therefore, the correct answer is B. f(2) = 21.