# Inverse/Domain Question

• Jan 28th 2013, 06:39 AM
andy07070
Inverse/Domain Question
i have this question:

Restrict the domain of the function f(x) = (2x-3)/(x2-x) so that an inverse function exists. Find the range and domain.

I've tried to find the inverse of this function, but have found it difficult to make x the subject. Any suggestions?
• Jan 28th 2013, 06:42 AM
emakarov
Re: Inverse/Domain Question
Sketch the graph.
• Jan 28th 2013, 06:44 AM
andy07070
Re: Inverse/Domain Question
Thats it? For all other questions it has been specified when i should solve graphically, this time it hasn't, so i have presumed he wants it to be solved by other means
• Jan 28th 2013, 07:00 AM
emakarov
Re: Inverse/Domain Question
The question does not ask you for the formula of the inverse function, only for its range and domain. After you sketch the graph of the original function, you may find its critical points, and this may be enough to find the domain and range. Of course, course requirements vary and you may be required to prove that the graph indeed behaves as in your sketch (for example, that the x-axis is the horizontal asymptote).

But I usually sketch the graph anyway, if only to understand what I am supposed to prove next.