Given function is .

Replace with y.

Next Switch x for y and y  for x.

Next solve for y:

                         (Multiply: )

                 (Multiply each side by 2)

          (Apply distributive property: )

                 (Cancel common terms)

                                 (Multiply: )

            (Multiply each side by negative one)

     (Apply distributive property: )

                     (Product of two same signs is positive)

                                 (Product of two different signs is negative)

             (Subtract 1 from each side)

             (Apply commutative property: )

                   (Apply additive inverse property: )

                         (Apply additive identity property: )

                    (Divide each side by 3)

                         (Cancel common terms)

                       (Simplify)

 The value of .

Write in function notation,using to represent the invrse of the function f.

"Y " value substitute in above function,

.

The invrse of the function is .