When 4 is subtracted from the square of a number, the result is 3 times the number. Find the positiv

Discussion in 'Calculator Requests' started by math_celebrity, Mar 19, 2019.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    When 4 is subtracted from the square of a number, the result is 3 times the number. Find the positive solution.

    Let the number be n. We have:
    n^2 - 4 = 3n

    Subtract 3n from each side:
    n^2 - 3n - 4 = 0

    Typing this quadratic equation into the search engine, we get:
    n = (-1, 4)

    The problem asks for the positive solution, so we get n = 4.
     

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