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Need help with my homework

  1. Dec 7, 2007 #1
    1. The problem statement, all variables and given/known data


    calculate Δƒ/Δx and Δƒ/Δy.


    ƒ(x,y) = x(y^2) + (x^2)y


    any help will be appreciated
     
  2. jcsd
  3. Dec 7, 2007 #2

    cristo

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    You need to show some work before we can help you. In order to attempt the question, you first need to know what Δƒ/Δx and Δƒ/Δy are. Can you tell us?
     
  4. Dec 7, 2007 #3
    well what i did was

    Δƒ/Δx = 2*x*y + y^2
    Δƒ/Δy = x^2 + 2*x*y

    but iam not sure if iam doing this right

    f(x,y) confuses me forgot how to deal with this
     
    Last edited: Dec 7, 2007
  5. Dec 7, 2007 #4

    Dick

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    It looks like you are taking partial derivatives of f(x,y) wrt to x and y. IF that's what you were trying to do, then you are in good shape.
     
  6. Dec 7, 2007 #5
    so then my answer

    Δƒ/Δx = 2*x*y + y^2
    Δƒ/Δy = x^2 + 2*x*y


    is correct right? for f(x,y)
     
  7. Dec 7, 2007 #6

    Dick

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    Whether your answer is correct depends on what the question is. It's right if your delta notation is supposed to mean 'partial derivative'. It's not the usual notation.
     
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