Let z axis as the surface axis and intersections of the surface with planes parallel to the xz and ya planes are parabolas. The level of curvature (constants) in the 362 and yz planes are same which is equal to one. The intersections of the surface with planes parallel to and above the xy plane is circle. Use the gradient method to approximate the relative minimum value at vertex of this opens up paraboloid. Start the iterative from the point 150 = (1, 1). (10 marks)