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Homework Help: I need some help.

  1. Feb 13, 2006 #1
    The problem says that if y=e^nx, then d^ny/dx^n=?

    I got that the result is n^2e^nx, but it is not among the offered choices. Can someone tell what did I mess up? Thanks.
     
  2. jcsd
  3. Feb 13, 2006 #2
    You're not differentiating twice, like you did ([tex]n^{2}e^{nx}[/tex]), but "n" number of times.
     
  4. Feb 13, 2006 #3

    Oh I see. I guess I shouldn't have assumed that it is a second derivative. Thanks for the help.:smile:
     
  5. Feb 14, 2006 #4

    HallsofIvy

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    Science Advisor

    Yes, in general it is a mistake to assume something when you are told differently!
     
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