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27 February, 16:14

The length of a rectangle is 4 units less than twice the width. What is the length if the area of the rectangle is 160 square units?

Enter your answer as a number, like this: 42

Do not enter any units.

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Answers (1)
  1. 27 February, 19:57
    0
    A) L = (2*W) - 4

    B) L*W = 160

    B) L = 160/W

    Substituting that into A)

    160/W = (2*W) - 4

    160 = 2W^2 - 4W

    2W^2 - 4W-160 = 0

    Width = 10

    Length = 16
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