Re: Optimization Problem.

A better idea is for you to show us your own solution and we'll check where your mistake is...

Re: Optimization Problem.

Let x be the length of the showroom and y the width. We know that the area xy=500mē, so y=500/x.

3 walls will be built with brick and just 1 will be of glass, so:

C(x)=1200x+1200x+1200y+600y= 2400x+1800y= 2400x+1800(500/x)= 2400x+900000/x

Now just find the derivative of C(x) and solve C'(x)=0.

Re: Optimization Problem.

What you have done is correct. Why do you think it's wrong?