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Homework Help: Derivative of sqrt(xy)

  1. Mar 3, 2009 #1
    1. The problem statement, all variables and given/known data
    What is the derivative of sqrt(xy) with respect to y?

    2. Relevant equations

    3. The attempt at a solution

    The sqrt(xy) is equal as (xy)^(1/2), so therefore what I have is 1/2 (xy) ^ -1/2, why is this wrong?
  2. jcsd
  3. Mar 3, 2009 #2

    Tom Mattson

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    Staff Emeritus
    Science Advisor
    Gold Member

    You've forgotten to use the Chain Rule. You have to differentiate the function inside the radical.
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