Question 36521
So thats:
2l+2w=400
l=200-w (subsituttion)
Area:
lw=A
Subsitute:
(200-w)(w)=A
200w-w^2=A
Differentate:
2w=200
w=100
Hence, the width and length are 100 ft each and the area is 100^2 ft squared.
Paul.