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19 March, 23:34

Find the dimension of a rectangle whose width is 10 miles less than its length and whose area is 75 square miles

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  1. 19 March, 23:50
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    W = L - 10

    75 = L * (L - 10)

    75 = L^2 - 10L

    L^2 - 10L - 75 = 0

    (L - 15) (L + 5) = 0

    L = 15

    w = 15 - 10

    w = 5

    2 dimension
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