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

Inverse functions

  1. Jul 4, 2008 #1
    We have y=f(x), and get the inverse by uing the first function and solving it for x and get x=g(y). (F and g are different functions.) Then we swap the name of x and y and we get y=g(x).

    Buw why can we do this when we want to find the inverse functions? If we got y=f(x) and want to find the inverse we take g(f(x))=x. But how is this related to the first thing I did?
  2. jcsd
  3. Jul 4, 2008 #2


    User Avatar
    Science Advisor

    Since y= f(x), g(f(x))= x is the same as g(y)= x.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook