# Math Help - Max/min with partial derivatives

1. ## Max/min with partial derivatives

I am having problems with a few homework questions. I am supposed to find and classify the critical points of these functions:

1.) f(x,y)= x^2 + y^2 + 2x - 4y

2.) f(x,y)= x^3 + y^3 - 6xy

Any help would be greatly appreciated! Thanks

2. Originally Posted by cam_ddrt
I am having problems with a few homework questions. I am supposed to find and classify the critical points of these functions:

1.) f(x,y)= x^2 + y^2 + 2x - 4y

2.) f(x,y)= x^3 + y^3 - 6xy

Any help would be greatly appreciated! Thanks
Hello.
To find the critical points, for each function solve the equations:
$f_x=0$ and $f_y=0$.

T