Recent content by Shmoo

Homework Statement Determine the critical points f(x,y) = x^3y + xy Homework Equations The Attempt at a Solution fx(x,y) = 3x^2 + y 3x^2y+y=0 y(3x^2 +1) = 0 y = 0 3x^2=1 x=1/3fy(x,y) = x^3 + x x^3 + x = 0 x(x^2+1) = 0 x=0 x^2= -1 x= -1 I don't know how to take it from here as I have...