> plot3d((700-10)*Q1+(500-10)*Q2-2*Q1^2-2.5*Q2^2, Q1=0..350, Q2=0..200, axes=boxed);

> partial1:=diff((700-10)*Q1+(500-10)*Q2-2*Q1^2-2.5*Q2^2,Q1);

> partial2:=diff((700-10)*Q1+(500-10)*Q2-2*Q1^2-2.5*Q2^2,Q2);

> solve({partial1=0,partial2=0},{Q1,Q2});

> ?solve

> ?plot3d

Ovenstaaende er eksempel 15.25 med a1=700, b1=2, a2=500, b2=2.5, alpha=10