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

I Inverse of a function

  1. Jun 17, 2016 #1
    Hi,
    What is the inverse of f(x)= e^x + e^-x +1?
     
  2. jcsd
  3. Jun 17, 2016 #2
    This question has been intimidating me for quite a while. I'm unable to reach a definite conclusion to this. Please help
     
  4. Jun 17, 2016 #3
    Try solving $$e^x+e^{-x}+1=y.$$
     
  5. Jun 17, 2016 #4

    mathman

    User Avatar
    Science Advisor
    Gold Member

    Convert problem into a quadratic equation by [itex]u=e^x,\ u^2+1+u(1-y)=0[/itex]. Get u as a function of y, then x=ln(u).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted