# Math Help - critical points calc 3

1. ## critical points calc 3

im having trouble finding c.ps
$
f(x,y)=(x^2 - 3xy + y^2)e^-(x^2 + y^2)

$

so far i have (0,0)

after adding and subtracting the partial derivatives

are there any other?

2. Originally Posted by statman101
im having trouble finding c.ps
$
f(x,y)=(x^2 - 3xy + y^2)e^-(x^2 + y^2)

$

so far i have (0,0)

after adding and subtracting the partial derivatives

are there any other?
Put { } around anything you want as exponent:
$f(x,y)= (x^2- 3xy+ y^2)e^{-(x^2+ y^2)}$.

I'm not at all clear why you would "add and subtract partial derivatives". What did you get for the partial derivatives?