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Partial differentiation

  1. Feb 19, 2006 #1
    i ve never read partial DE...nd i dont kno how to do this question i got in homework...plzz help
    (x^2+y^2+z^2)^-1/2=V
    prove dv^2/dx^2 + dv^2/dy^2 + dv^2/dz^2 = 0
    (i wrote "d" for partial differential)
    i know its a basic question but i cant understand the technique
     
  2. jcsd
  3. Feb 19, 2006 #2

    HallsofIvy

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    What course is this for?
    It doesn't matter that you have "never read partial DE"- this problem has nothing to do with differential equations. It has to do with taking the derivative. If you mean you have not done partial derivatives, the derivative of V with respect to x is just the ordinary derivative, treating y and z as constants. Similarly, the derivative of V with respect to y is just the ordinary derivative, treating x and z as constants; the derivative of V with respect to z is just the ordinary derivative, treating x and y as constants.

    Find the second derivative of V with respect to each variable, and add them!
     
  4. Feb 20, 2006 #3
    thx....that was easy
    it is for Calculus 2 course
     
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