Calculus Find max and min and saddle
posted by Lucy .
Find and classify all local min and maxima and saddle points of the function f(x,y)=/3yx^23xy^2+36xy
I know there are 3 saddle points and one maxima.
This is what I got:
D=FxxFyy(Fxy)^2
= 36xy36(x+y6)^2
But how do i solve for zero?? Im lost on this one. Please help me figure out these points??

Calculus Find max and min and saddle 
MathMate
First you'd have to find the local maxima/minima. If you have obtained the (four) points, then you can use the second derivative test to determine if each one is a maximum/minimum or saddle point.
Have you found the critical points?
(Unfortunately the definition of f(x,y) above does not seem to be complete.)
Note:singular: maximum, plural: maxima. 
Calculus Find max and min and saddle 
George
Lucy
I think you are wrong,what I got is much that I can't type ,mayb some social network or video call .
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