function y = Hf53(x)
%HF53 hessian of f5 for c=100.CMSC 764 HW1.
%
%  See F53.

%  Geping Liu 09-21-06
y = [ -98+1200*x(1)^2+400*x(2)^2,          800*x(2)*x(1)
          800*x(2)*x(1),           -98+1200*x(2)^2+400*x(1)^2];