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Differentiating with respect to

  1. Jan 12, 2007 #1
    differentiating with respect to....

    I have a question on differentiating the function z/(2x + y) with respect to x.

    Is the answer -2z/(2x + y)^2 ?

  2. jcsd
  3. Jan 12, 2007 #2
    yes absolutely right... z and y are constant with respect to x
  4. Jan 12, 2007 #3


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    Homework Helper

    The other way arround actually, if z and y are constant wrt x, then your answer (the partial derivative of the function wrt x) is right :smile:
  5. Jan 12, 2007 #4


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    Staff Emeritus
    Science Advisor

    If z and y are NOT "constant with respect to x", but are functions of x, then you would use the chain rule.
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