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Help with a partial derivative question, thanks.

  1. Oct 2, 2009 #1
    Use the table of values of f(x,y) to estimate the values of each of the following partial derivatives.

    y=4.2 || 2.75262 ||| 0.27222 ||| 0.27107
    y=4 ||| 5.74559 ||| 2.84839 ||| 0.64973
    y=3.8 || 7.42708 ||| 5.84832 ||| 3.25237
    ||||||||| x=3.8 |||||| x=4 ||||||| x=4.2

    fx(4.2 , 4) =
    fxy(4 , 4) =

    I know how to get fx, but dont know how to get fxy.
    Hopefully you guys can teach me.
    Thanks a lot!
  2. jcsd
  3. Oct 5, 2009 #2


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    Welcome to PF!

    Hi kidzonety! Welcome to PF! :smile:

    (try using the X2 tag just above the Reply box :wink:)
    Do you know how to get fxx?

    If so, use fxy = (fx+y,x+y + fx-y,x-y)/4 :wink:
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