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Finding local extreme values

  1. Mar 2, 2012 #1
    1. The problem statement, all variables and given/known data

    see attachment

    3. The attempt at a solution

    I don't understand how they found fxy = 1

    I understand how they found fxx, they used simultaneous equations, but I don't understand that notation.
     

    Attached Files:

  2. jcsd
  3. Mar 2, 2012 #2

    LCKurtz

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    They didn't find ##f_{xx}## by using simultaneous equations. They just differentiated ##f## twice with respect to ##x##. Then to get ##f_{xy}## they differentiated ##f_x## with respect to ##y##.
     
  4. Mar 2, 2012 #3
    Thanks, that makes sense.
     
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