clc
clear

x = -10:0.5:10;
y = -10:0.5:10;

[X, Y] = meshgrid(x, y);

Z = X.^2 - 2.*X.*Y + 4.*Y.^2;

surf(X, Y, Z);

hold on;
contour3(X, Y, Z, 20);

title('Final Exam Problem No. 5, by "Kimberly Randle"');
xlabel('x');
ylabel('y');
zlabel('z');

grid on;