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: Instantaneous Rate of Change Problem

  1. Nov 18, 2012 #1
    1. The problem statement, all variables and given/known data
    Find the instantaneous rate of change for the function y2+(xy+1)3=0 at (2,-1)


    2. Relevant equations
    N/A


    3. The attempt at a solution
    I tried getting it into a "y=" format but I don't really understand how to deal with the y when it's squared in one part and cubed in the other. This is as far as I could figure:
    y=(-(xy+1)3)1/2

    Thanks for any help!
     
  2. jcsd
  3. Nov 18, 2012 #2

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Use implicit differentiation.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook