The function f x x 8 X 4 is one to one For the function a Find an equation for f x the inverse function b Verify that your equation is correct by showing that f f x x and f f x a Select the correct choice below and if necessary fill in the answer box to complete your choice Simplify your answer Use integers or fractions for any numbers in the expression O A f x for x OB f x O c f x OD f x for x 2 for x for all x