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March 28, 2017

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ye has 44 feet of fencing to enclose a rectangular garden. She wants to to enclose as much area as possible. use trial and error to find maximur are faye can enclose with all 44 feet of fence. name the lencth and width that gives maximum area.

  • geometry - ,

    length + width = 22
    w = 22-L
    A = w L = (22-L)L

    A = 22 L - L^2

    that is a parabola, find the vertex
    L^2 - 22 L = -A
    L^2 - 22 L + 121 = -A+121
    (L-11)^2 = -A + 121
    vertex (maximum of A) at L = 11, A = 121
    then w also = 11
    and it is a SQUARE :)

  • geometry - ,

    safa

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