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!

Homework Help: 2 Problems of mine

  1. Nov 17, 2009 #1
    1.My first problem revolves around the preimage of a function. I have never truly understood this concept, if anyone can clear this with a simple example I would appreciate it.
    2.Does x-1=e^-x a solution in the interval [-2, 2] have?
  2. jcsd
  3. Nov 17, 2009 #2


    User Avatar
    Science Advisor

    German? You are putting all your verbs at the end of the sentence!:devil:

    It's pretty easy to see, isn't it, that when x= 0 x-1= -1 and [itex]e^{-x}= e^{-1}> -1 while if x= 2, x-1= 1 and e^{-2}= .1356< 1.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook