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Homework Help: Partial Derivatives

  1. Mar 1, 2009 #1
    1. The problem statement, all variables and given/known data
    f(x,y)=e^(3x+9y)
    find fsubxx


    2. Relevant equations



    3. The attempt at a solution
    I got e^(3x+9y)3, but the stupid web assign wont take it as an answer. Im pretty sure this is the correct answer. Am i wrong? Please help =).
     
  2. jcsd
  3. Mar 1, 2009 #2

    S_Happens

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    Gold Member

    First, I would reorder the way you write the answer to avoid confusion.

    Second (hint), what is the difference in fx and fxx
     
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