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25 February, 17:30

The length of a rectangle is 4 inches more than its width. If the area of the rectangle is 45 sq. inches, what is the width?

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  1. 25 February, 20:30
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    The width is 9 bc 5+4 is 9 and 9x5 is45
  2. 25 February, 20:54
    0
    L = length

    w = width

    l = w + 4

    A = l * w

    45 = (w+4) * w

    45 = w^2 + 4w

    0 = w^2 + 4w - 45

    Use the factors of 45 to identify the missing coefficients.

    45: 1, 45, 3, 15, 5, 9 (5 and 9 can give me 45 as the product and 4 as a difference.

    (w + 9) (w - 5)

    Thus if the length is 4 inches more than its width, the length = 9 inches and the width = 5 inches.
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