Answer:
f(x) = 3x + 2
x = 3f-1(x) + 2
x - 2 = 3f-1(x)
(x - 2)/3 = f-1(x)
(14 - 2)/3 = f-1(14)
12/3 = f-1(14)
4 = f-1(14)
f(f-1(14)) = f(4)
f(4) = 3(4) + 2
f(4) = 12 + 2
f(4) = 14
A function and its inverse are inverse operations, like addition and subtraction. They undo each other.
f(f-1(x) = x
Explanation: