Results 1 to 2 of 2

Math Help - Proving functions Question

  1. #1
    Junior Member
    Joined
    Sep 2009
    Posts
    39

    Proving functions Question

    How do I show that f(f^-1(x))=x? Where do I start working from and what do I substitute?

    Thanks!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor red_dog's Avatar
    Joined
    Jun 2007
    From
    Medgidia, Romania
    Posts
    1,252
    Thanks
    5
    If f(x)=y then f^{-1}(y)=x.

    Then f(x)=f(f^{-1}(y))=y.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. proving functions onto
    Posted in the Discrete Math Forum
    Replies: 3
    Last Post: October 28th 2010, 07:02 AM
  2. Proving Generating Functions
    Posted in the Discrete Math Forum
    Replies: 2
    Last Post: March 3rd 2010, 01:47 PM
  3. Proving coordinate functions
    Posted in the Discrete Math Forum
    Replies: 3
    Last Post: January 27th 2010, 10:10 AM
  4. Proving functions
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: February 17th 2009, 06:27 AM
  5. Proving bijective functions
    Posted in the Discrete Math Forum
    Replies: 7
    Last Post: November 29th 2007, 11:31 AM

Search Tags


/mathhelpforum @mathhelpforum