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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

    HallsofIvy

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    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.
     
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