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: What am I doing wrong in finding the derivative and max/min?

  1. Jun 3, 2013 #1
    1. The problem statement, all variables and given/known data

    I need to find the max/min of y=(1)/(3+x^2)

    2. Relevant equations


    3. The attempt at a solution

    I tried to find the derivative; y'= (3+x)^-2(1) = -2(3+x)^-3 = -2/(3+x)^3 or -2/3(3+x)^2?

    Whats wrong with it?
  2. jcsd
  3. Jun 4, 2013 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Well, for starters, the derivative you calculated is wrong. What derivative rule are you using? Your attempt suggests some confusion.
  4. Jun 5, 2013 #3
    Start off by using the chain rule (or quotient rule, whichever you prefer) to find the derivative of the function.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted