1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Find x.y=2/xy=e^(x-4)

  1. Feb 22, 2010 #1
    find x.

  2. jcsd
  3. Feb 22, 2010 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    Re: exponentials

    2/x= e^(x-4)= e^x e^(-4)

    2= x e^x e^(-4)

    xe^x= 2e^4

    x= W(2e^4) where W is Lambert's W function:

    which is defined as the inverse function to xe^x.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook