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: Taking derivative

  1. Jul 20, 2006 #1
    given function f(x) =exp(-x^2)

    is f'(x) = -x^2*exp(-x^2), or

    f'(x) = -x^2*exp(-x^2)*-2x= 2x^3*exp(-x^2)

    just confused what the rules are when taking the derivation of those kind sof function
  2. jcsd
  3. Jul 20, 2006 #2


    User Avatar
    Science Advisor

    What's wrong with the chain rule?
  4. Jul 20, 2006 #3


    User Avatar
    Homework Helper

    [tex] f^{\prime}(x) = \frac{d}{dx} \left( e^{-x^2}\right) = e^{-x^2}\frac{d}{dx}\left( -x^2\right) [/tex]

    that's the chain rule step, finish it off.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook