I have the eq. f(x,y) = 2x^2 + x^2y + y^3 + 12y^2

trying to find the stationary points for this eq.

i have the p.derivatives at:

fx = 4x - 2xy

fy = x^2 + 3y^2 + 24y

fxx = 4 + 2y

fyy = 6y + 25

fxy = 2x

my issue lies is that i need to find the 4 stationary points

for fx i have factored out to reach fx=x(4 + 2y)

and for fy = x^2 + y(3y + 24)

from here i am unsure how i get my x and y points if someone could show me how to go from here it would be very helpful