enclosing a rectangular plot that borders a river

Algebra
Tutor: None Selected Time limit: 1 Day

you have a 200 feet of fencing to enclose a rectangular plot that borders a river. if you do not fence in the side along the river, find the length and width of the plot that will maximize the area. what is the largest area that can be enclosed?

May 11th, 2015

Since the side along the river does not need fencing:

L + 2W = 200

and

Area = LW

but L = 200 - 2W,  so we can substitute

Area = (200 - 2W)W

Area = 200W - 2W^2

This is a quadratic equation, so we can find the maximum area which is located at the VERTEX

Put equation into standard form

-2W^2 + 200W = 0

The W value for the vertex is given by the formula -b/2a

= -200) / 2(-2) = 200 / 4 = 50

Then L = 200 - 2(50) = 200 - 100 = 100

Therefore, the maximum area is

(100)(50) = 5000 square feet

May 11th, 2015

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May 11th, 2015
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