Optimization

fghtffyrdmns

0<x<8 (cannot be equal to since it makes no sense to cut 8 cm or 0 cm.) X is the element of any real number is the domain.

So I can't solve now?

Edit: 0 and 8 do not work .

Mark44

You can choose to not make the cut at all, so that you make only a square or only a circle. So the domain of A(x) is {x in the real numbers| 0 <= x <= 8}.

Now finish the problem. Be sure to check x = 0 and x = 8 after you have solved A'(x) = 0. That way you can be sure you have found the absolute maximum area.