Algebra

the length of a rectangle is 2 more than the width, the area of the rectangle is 15 ft. squared . find the length and width.

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asked by Susan
  1. well since 15 = 3*5, I guess that pretty well solves the problem, no?

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    posted by Steve
  2. Width = W Ft.
    Length = (W+2) Ft.

    Area = (W+2)*W = 15Ft^2
    W^2 + 2W - 15 = 0
    C = -15 = -3*5
    (W-3)(W+5) = 0

    W-3 = 0
    W = 3

    W+5 = 0
    W = -5. The width can't be negative.
    Therefore, W = 3 Ft.

    Length = W+2 = 3 + 2 = 5 Ft.

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    posted by Henry

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