1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Double derivative of a quotient

  1. Aug 12, 2011 #1
    Find d^2y/dx^2 when dy/dx = (3x^2 - 24x - 45) ÷ 2y

    i tried by (6x-24) ÷ 2y. Unsure what to do about the y on the denominator.
  2. jcsd
  3. Aug 12, 2011 #2
    dy/dx = (3x2-24x-45) * (2y)-1

    Use the product rule and the chain rule (the derivative of y is dy/dx). After you have that, make a substitution for dy/dx, since you already have that. Of course, you'll also need y2, so you also need to integrate using separation of variables to find what y2 is.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook