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17 August, 23:09

The length of a rectangle is 5m more than twice the width, and the area of the rectangle is 63m2. find the dimensions of the rectangle.

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  1. 17 August, 23:36
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    Length = 2w + 5

    Area = l * w

    63 = 2w + 5 * w

    63 = 2w² + 5w

    2w² + 5w-63=0

    (2w-9) (w+7)

    2w-9 = 0 w+7=0

    2w-9+9=0+9 w+7-7=0-7

    2w = 9 w = - 7

    2w/2=9/2

    w = 4.5

    Since the width can not negative the width is 4.5

    Length = 2 (4.5) + 5

    Length = 9 + 5

    Length = 14

    Check

    Area = 4.5 * 14

    63 = 63
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