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: Differentiate this, i need help

  1. Feb 25, 2007 #1
    y=ex(x is suppost to be smaller and on the top right of e)/x squared

    i a suppost to differentiate this, well i wrote -2ex/x cubed+ ex/ x sq.

    now u probabl might be confused by the way i wrote it since i dont know how to put the right things for my problems,

    well i set up the problem how do i figure out the answer,

    i know the answer but how do i figure it out
    Last edited: Feb 25, 2007
  2. jcsd
  3. Feb 25, 2007 #2


    User Avatar
    Gold Member

    Is this what you are getting at y = ex/x2?

    Would it help if you rewrite it as a product rule:
  4. Feb 26, 2007 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    This is correct.
  5. Feb 26, 2007 #4

    Gib Z

    User Avatar
    Homework Helper

    Let [itex]u=e^x[/itex] and [itex]v=x^2[/itex].

    By the quotient rule, the derivative is [tex]\frac{u'v-v'u}{v^2}[/tex]
  6. Feb 26, 2007 #5


    User Avatar
    Staff Emeritus
    Science Advisor

    I must've skipped over this, and so didn't notice that you wanted to know how to get the answer!!

    Well, anyway, now you've got two ways; using the product rule as shown by ranger, or the quotient rule given by Gib Z.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook