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March 29, 2017

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the length of a rectangle is seven less than four times the width. Find the length if the area is 65 square units.

  • Math - ,

    L = (4 w - 7)
    Lw = 65
    (4w-7)w = 65
    4 w^2 - 7 w - 65 = 0
    ( w - 5 )(4 w + 13 ) = 0
    w = 5
    L = 4(5) - 7 = 13

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