Precalculus

A farmer with 10000 meters of fencing wants to enclose a rectangular field and divide it into two plots with a fence parallel to the sides. What is the largest area that can be enclosed?

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  1. He has 10 km of fence to fence in a field on a farm ??
    Anyway ...

    Let each of the lengths be y
    let each of the shorter sides by x
    so we need 2y + 3x
    2y + 3x = 10000 ---> y = (10000-3x)/2

    area = xy
    = x(10000-3x)/2
    = 5000x - (3/2)x^2
    d(area)/dx = 5000-3x
    = 0 for a max of area
    3x = 5000
    x = 5000/3 m or 1666 2/3 m
    sub that into area
    then area = 4,166,666.667 m^2

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  2. lika sum bodee

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  3. Will you do this same problem but the farmer has 400m of fencing.

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