Results 1 to 5 of 5

Math Help - Homework question help / inverse functions

  1. #1
    Newbie
    Joined
    Sep 2011
    Posts
    4

    Homework question help / inverse functions

    I was working through some hmwk problelms and couldn't get the right answer for this one. Figured I would post and see if anyone could help:

    Find the inverse of f(x) = (e^2x) / (5 + e^2x)

    Thanks for any help.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,605
    Thanks
    1574
    Awards
    1

    Re: Homework question help / inverse functions

    Quote Originally Posted by dgove42 View Post
    I was working through some hmwk problelms and couldn't get the right answer for this one. Figured I would post and see if anyone could help:
    Find the inverse of f(x) = (e^2x) / (5 + e^2x)
    Exchanging x for y can you get:
    e^{2y}=\frac{5x}{1-x}~?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2011
    Posts
    4

    Re: Homework question help / inverse functions

    Thanks for the fast response.

    How would I get the left side in terms of f(inverse)(x) = ???

    i.e. How would the left side be only "y" instead of "e^2y"?

    Thanks for your help.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor Siron's Avatar
    Joined
    Jul 2011
    From
    Norway
    Posts
    1,250
    Thanks
    20

    Re: Homework question help / inverse functions

    Take the natural logarithm of both sides.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Sep 2011
    Posts
    4

    Re: Homework question help / inverse functions

    Thanks for all the help, I got the right answer.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: August 17th 2010, 04:43 AM
  2. Quick question on Inverse Functions
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 25th 2009, 08:02 PM
  3. homework question Functions
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: October 21st 2008, 01:21 PM
  4. Question Regarding Inverse Trig Functions
    Posted in the Trigonometry Forum
    Replies: 6
    Last Post: September 6th 2008, 07:43 PM
  5. Quick question about inverse functions.
    Posted in the Pre-Calculus Forum
    Replies: 8
    Last Post: September 27th 2006, 05:01 PM

Search Tags


/mathhelpforum @mathhelpforum