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Mathematica- Inverse Functions

  1. Aug 15, 2009 #1
    I'm trying to find the inverse of a function, for instance: f(x)=(2x+1)/(x-1) using Mathematica but it doesn't produce any answers.

    This is my input:

    > f(x)=(2x+1)/(x-1)

    > InverseFunction[f]

    The output is always something like:

    "InverseFunction[(1+2x)/(-1+x)]"

    So, does anyone know what the problem is?

    Thanks,
     
  2. jcsd
  3. Aug 15, 2009 #2

    Dale

    Staff: Mentor

    InverseFunction only evaluates for built-in functions like trig functions. I think you want:
    Solve[y == (2 x + 1)/(x - 1), x]
     
  4. Aug 16, 2009 #3
    Oh I see... Thank you! :smile:
     
  5. May 10, 2010 #4
    Thank you very much roam, you've helped me to solve a big problem.
     
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