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1 December, 20:11

The length of a rectangular photo is 3 cm less than twice its width. If the area of the photo is 104 square cm, Find the length and width of the photo.

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  1. 1 December, 22:29
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    A = L * W

    A = 104

    L = 2W - 3

    104 = W (2W - 3)

    104 = 2W^2 - 3W

    2W^2 - 3W - 104 = 0

    (2W + 13) (W - 8) = 0

    2W + 13 = 0

    2W = - 13

    W = - 13/2 ... this will not work, extraneous solution

    W - 8 = 0

    W = 8 < = = width

    L = 2W - 3

    L = 2 (8) - 3

    L = 16 - 3

    L = 13 <===length
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