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18 November, 08:18

A rectangular playground covers 4500m^2 its length is 40m longer than its width. what is the width of the playground?

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  1. 18 November, 09:52
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    LW=area=4500

    L=40+W

    (40+W) (W) = 4500

    W²+40W=4500

    W²+40-4500=0

    factor

    (W-50) (W+90) = 0

    set to zero

    W-50=0

    W=50

    W+90=0

    W=-90

    false, can't have negative measures

    W=50

    L=40+W

    L=40+50=90

    the width is 50 m
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