Question

求函数f(x,y)=x^3-y^3+3x^2+3y^2-9x=15在(-3,2)附近的极大值

Answer 1

for x=-3:-1

y=(-x^2+3)/2

end

for x=-1:3

y=-x^2+1

end

figure

hold on;

x=-3:3

plot(x,y,'--m.','MarkerEdgeColor','m');