Homework Help: Calculus

Posted by Salman on Friday, November 6, 2009 at 8:19am.

A rancher wants to fence in an area of 500000 square feet in a rectangular field and then divide it in half with a fence down the middle, parallel to one side.

What is the shortest length of fence that the rancher can use?

Calculus - Reiny, Friday, November 6, 2009 at 8:41am
I will set it up for you.
Let the length of the rectangle be y feet
let its width be x feet. The divider will then be x feet
So the length L
= 3x + 2y

but you know that xy = 500000
and y = 500000/x

then
L = 3x + 2(500000/x)

differentiate, set that equal to zero and solve for x
Put x back into L = ...
and you are done
Calculus - lkl, Thursday, November 29, 2012 at 12:01pm
2345678
Calculus - Anonymous, Thursday, March 14, 2013 at 9:02pm
c

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