Hi,

I would like some help with a problem.

Show that has an inverse and find

How do you invert fractions like this?

//Jones

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- December 30th 2009, 02:05 AMJonesThe inverse of a function
Hi,

I would like some help with a problem.

Show that has an inverse and find

How do you invert fractions like this?

//Jones - December 30th 2009, 05:28 AMskeeter
- December 30th 2009, 06:03 AMHallsofIvy
Note, that this problem did NOT ask you to actually find the inverse function- and skeeter did not. However, since you asked:

Start by witing the function as

and swapping x and y:

Now solve for y:

Solve that cubic equation for y. That, of course, is the hard part and probably why the problem did**not**require you to find the inverse! - December 30th 2009, 06:48 AMJones
Oh dang, i thought you had to solve the darn thing