When 3 consecutive positive integers are multiplied, the product is 16 times the sum of the 3 intege

Discussion in 'Calculator Requests' started by math_celebrity, Dec 25, 2017.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    When 3 consecutive positive integers are multiplied, the product is 16 times the sum of the 3 integers. What is the difference of the product minus the sum?

    Let the 3 consecutive positive integers be:
    1. x
    2. x + 1
    3. x + 2
    The product is:
    x(x + 1)(x + 2)

    The sum is:
    x + x + 1 + x + 2 = 3x + 3

    We're told the product is equivalent to:
    x(x + 1)(x + 2) = 16(3x + 3)
    x(x + 1)(x + 2) = 16 * 3(x + 1)

    Divide each side by (x + 1)
    x(x + 2) = 48
    x^2 + 2x = 48
    x^2 + 2x - 48 = 0

    Now subtract the sum from the product:
    x^2 + 2x - 48 - (3x + 3)
    x^2 - x - 51
     

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