# Math Help - finding an inverse of a rational function :D

1. ## finding an inverse of a rational function :D

Trying to find the inverse of y in the rational equation that's attached via image. There's the work I did that's also attached. Can anyone spot what I did wrong please?

2. ## Re: finding an inverse of a rational function :D

After you have swapped x and y you need to solve for y, not x.

Have another go at it.

3. ## Re: finding an inverse of a rational function :D

Look at your answer in the screenshot, your function $f^{-1}$ seems to be independent of any $x$. The computer is expecting it in your definition...