How do you find critical points of multivariable function #f(x,y) =x^3 + xy - y^3#?
Several notations and explanations are available. Here's one:
Find the partial derivatives, set them equal to zero and solve the resulting system of equations.
From the first equation:
So, we need:
and also when
The critical points are:
(I've heard that there is an alternative terminology that would find the values of