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7 April, 00:44

The width of a painting is 4 inches less than the length, and the surface area is 320 square inches. Find the length.

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Answers (2)
  1. 7 April, 02:34
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    The length is 20 inches. 20 times 16 equals 320 so the length is 20 inches and the width is 16.
  2. 7 April, 03:46
    0
    320 = L * (L - 4)

    320 = L^2 - 4l

    L^2 - 4L - 320

    Use quadratic formula

    W = (-b + - sqrt (b^2 - 4ac)) / 2a

    W = - 20 and 16

    The width can't be negative so width = 20inches
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