Question

A farmer is planning a rectangular area for her chickens. The area of the rectangle will be 800 feet. Three sides of the rectangle will be formed by fencing, which costs $5 per foot. The fourth side of the rectangle will be formed by a portion of the barn wall, which requires no fencing. In order to minimze the cost of the fencing, how long should the fourth side be?

A.40ft
B.20ft
C.16ft
D.50ft

Answer 1

This is quadratics, isn't it?

Answer 2

Yes

Answer 3

Well its geometry so I guess that fits right in there

Answer 4

Thought so. Let two of the sides be \(x\) and the third side \(y\)

Answer 5

so x^2-y ?