Question 928503
13x^2+6 square root 3+7y^2 +16 
this is an ellipic paraboloid 
polynomial discriminant is
delta x = -52(7y^2 +(6*square root(3)) +16)
min is (16 + (6*square root(3))) at (x,y) = (0,0)
y = square root(-13x^2 -(6*square root(3)) -16) / square root(7)
y = -square root(-13x^2 -(6*square root(3)) -16) / square root(7)