x_1, x_2, 
2*x_1^4-x_1^2*x_2^2+4*x_2^4+5*x_1^2*x_2+2*x_1*x_2^2-5*x_2^3-3375
-2*x_1^3*x_2^2+2*x_1^2*x_2^3-x_1*x_2^4+5*x_1^4-4*x_1^3*x_2+2*x_1^2*x_2+10250
