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March 26, 2017

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length of a rectangle is 5y more than twice its width and area of the rectangle is 42 yards ^2, find the dimensions

  • Algebra - ,

    width --- x
    length ---- 2x + 5 (assuming your 5y is a typo)

    x(2x+5) = 42
    2x^2 + 5x - 42 = 0
    (x+6)(2x-7) = 0
    x = -6 or x = 7/2 , but the width cannot be negative, so

    the width is 7/2 or 3.5
    the length is 12

    check:
    3.5(12) = 42

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