### Home > PC > Chapter 1 > Lesson 1.2.2 > Problem 1-86

1-86.

Find *f ^{−}*

^{1}(

*x*) if

*f*(

*x*) =

Change *f*(*x*) to *y*.

Switch all of the *x*'s to *y*'s and all of the *y*'s to *x*'s.

Solve for *y*.

1-86.

Find *f ^{−}*

Change *f*(*x*) to *y*.

Switch all of the *x*'s to *y*'s and all of the *y*'s to *x*'s.

Solve for *y*.