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13 June, 22:06

The length of a rectangle is 4 meters less than twice its width. The area of the rectangle is 70m2. Find the dimensions of the rectangle

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  1. 13 June, 23:44
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    If the width = x m then the length = 2x - 4 m

    Area = x (2x - 4) = 70

    2x^2 - 4x - 70 = 0

    2x^2 - 14x + 10x - 70 = 0

    2x (x - 7) + 10 (x - 7) = 0

    (2x + 10) (x - 7) = 0

    x = 7 or - 5 (ignore negative)

    width = 7 m and length = 10 m answer
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