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17 February, 04:28

The length of a rectangular box is 2 units less than its width.

If the area of the box is 15 units square.

Find the perimeter of the box.

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  1. 17 February, 04:55
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    Length, l

    width, w

    l = w - 2

    15 = lw

    15 = (w-2) w

    w^2 - 2w = 15

    w^2 - 2w - 15 = 0

    w^2 - 5w + 3w - 15 = 0

    w (w - 5) + 3 (w - 5) = 0

    (w + 3) (w - 5) = 0

    w = 5 or w = - 3

    possible not possible

    width = 5 units

    length = 3 units
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