Final answer:
The expression that is equal to f(1) • f(2) for an exponential function is f(2)^1, which is equivalent to f(1) • f(2).
Step-by-step explanation:
To find the value of f(1) • f(2) for an exponential function of the form f(x) = a^x, we substitute the values of 1 and 2 into the function. Therefore, we have:
f(1) = a^1 = a
f(2) = a^2 = a • a = a^1 • a
Putting it all together, f(1) • f(2) = a • a = a^2.
So, the correct expression is D) f(2)^1. This is equivalent to f(1) • f(2).