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4 October, 19:10

He length of a rectangular floor is 5 feet less than twice its width. the area of the floor is 150 square feet. what is the width of the room?

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  1. 4 October, 19:52
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    A = L * W

    A = 150

    L = 2W - 5

    150 = W (2W - 5)

    150 = 2W^2 - 5W

    2W^2 - 5W - 150 = 0

    (2W + 15) (W - 10) = 0

    2W + 15 = 0

    2W = - 15

    W = - 7.5 < = = not this one

    W - 10 = 0

    W = 10 <===the width is 10

    length is 2W - 5 ... 2 (10) - 5 ... 20 - 5 ... 15
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