Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Inverse function

  1. May 13, 2007 #1
    f(x) =2x + ln x
    f^-1(x)=?


    i do
    f(x)=2x +lnx=ln (e^2x) + ln x = ln [(e^2x)x]
    =>e^f(x)=e^2x(x)=>
    can eny body solve this equation
     
  2. jcsd
  3. May 13, 2007 #2
    There is no simple closed form for this inverse function.
    But there are many ways to calculate numerical values of this function.
    It is also possible to analyse it in great details, same job actually as for f, just reading in the reverse direction!
    If you are familiar with that, it might be possible to make a series expansion for it.

    Now, why would you need the inverse function explicitely?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Inverse function
  1. Inverse function (Replies: 7)

  2. Inverse of functions (Replies: 3)

  3. Function inversion (Replies: 1)

  4. Inverse functions (Replies: 1)

Loading...