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Homework Help: Two variable extreme value problem

  1. Nov 23, 2009 #1
    1. The problem statement, all variables and given/known data
    alright so this is just a general question. In order to solve an extreme value problem, there's a part where I have to use f base xy. I'm not quite sure what that is, I know f base x is the partial derivative of the function with regards to x, and f base xx is the second partial derivative for x.

    2. Relevant equations


    3. The attempt at a solution
    The only thing I can think of is that f base xy is simply the original function of x and y. Thanks in advance
  2. jcsd
  3. Nov 23, 2009 #2
    F base xy means differentiate with x while keeping y constant, then take the rest and differentiate with respect to y keeping x constant.
    f(x,y)= 3x^2+2xy
    f(x,y)x = 6x+2y
    f(x,y)xy = 2
  4. Nov 23, 2009 #3
    ok ya that makes sense. I guess I must have missed the class where we learnt that lol. Thanks.
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