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Derivative question

  1. May 22, 2010 #1
    1. The problem statement, all variables and given/known data
    [PLAIN]http://img696.imageshack.us/img696/4462/124234c23c423.jpg [Broken]


    3. The attempt at a solution

    I did the first part already, by letting
    u = ax => dx = du/a, then just substituting in the values.

    How do i explain why its negative?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 22, 2010 #2
    Try comparing the value of [itex] e^{-x} [/itex] to the value of [itex] (1+x)^{-1} [/itex]. Then prove the relationship you find, maybe with series expansions or some other way.
     
  4. May 22, 2010 #3

    LCKurtz

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    Hint: Its value doesn't depend on α. Find a nice value of α. to try.
     
  5. May 22, 2010 #4
    Im still stuck :(
     
  6. May 22, 2010 #5

    LCKurtz

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    What nice value of α have you tried?
     
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