# Express area as a function of x.

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• Apr 6th 2008, 09:33 PM
theevilp0ptart
Express area as a function of x.
Last one today, I swear.

A rectangular plot of land that borders on a river is the be fenced along 3 sides using 400 feet of fencing. Express the area of the fenced in land, A, as a function.

I don't even know how to set this one up. I began solving like this:
A=2x+(400-2x)=400
I know that's not even close. I think I need to terms for the width and the length.
• Apr 6th 2008, 09:43 PM
Jhevon
Quote:

Originally Posted by theevilp0ptart
Last one today, I swear.

A rectangular plot of land that borders on a river is the be fenced along 3 sides using 400 feet of fencing. Express the area of the fenced in land, A, as a function.

I don't even know how to set this one up. I began solving like this:
A=2x+(400-2x)=400
I know that's not even close. I think I need to terms for the width and the length.

let the side parallel the river be x. let the other two sides be y

then, x + 2y = 400

and A = xy

take it from here