Given function is .

Replace with y.

Next Switch x for y and y  for x.

Next solve for y:

      (Add 7 to each side)

        (Apply commutative property: )

               (Apply additive inverse property: )

                     (Apply additive identity property: )

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  .

.