Question

Given the function f(x) = 3^x, find the value of f^−1= (27)

Answer 1

f(x)=27 when x=9. The point is then (9, 27). If we switch places with x and y, we get (27, 9). f-1(27) = 9
the inverse function of f(x) is f-1(x) = (1/3)(x). Now you can find the answer, by substituting 27 into the formula for inverse.