cal3/algebra help me!
posted by Lucy on .
Find and classify all local minima, local maxima, and saddle points of the function f(x,y)= -3yx^2-3xy^2+36xy
I really need help answering this one!! Please answer in detail! Thank you
This is what I have so far...
Now set D=0 but I don't know how to solve it?? 36xy-36(x+y-6^2=0
Set Fx=0=-6x-6y+36 and set Fy=0=-6xy-3y^2+36y
I need help with the algebra, its been so long