Expert: Abe Mantell - 5/23/2009

Question
I am having trouble getting the right answers.  Can you show me the steps. Given this problem:
V=xyz= xy(12-xy)/2x+2y    Compute the partial derivatives with respect to x and then y

Given problem #2f(x,y,z) = 8x-4z; x2+10y^2+ z^2=5
find the maximum and the minimum.  Thank you for your help

Answer
Hello Megs,

V=xy(12-xy)/2x+2y ???  Is that correct?  If so, then the two
x's divide each other to simplify the expression:
V=y(12-xy)/2+2y ... yes?

If that is not correct, then please use parentheses where needed.
For example, if the "2x+2y" is the denominator, then it should
have parentheses around it...is it supposed to be
V=xy(12-xy)/(2x+2y)???

TTYL, Abe