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10 November, 21:54

One positive integer is 7

less than twice another. The sum of their squares is 433. Find the integers

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Answers (1)
  1. 11 November, 00:38
    0
    You use a system of equations to solve this.

    x will be one integer and y will be the other.

    2y - 7 = x

    x^2 + y^2 = 433

    You can plug (2y - 7) in for x in the second equation.

    (2y - 7) ^2 + y^2 = 433

    4y^2 - 28y + 49 + y^2 = 433

    5y^2 - 28y - 384 = 0

    y = 12 or - 32/5

    It has to be 12 since - 32/5 is not an integer.

    Plug 12 in for y to get x.

    2 (12) - 7 = x

    x = 17

    The integers are 12 and 17.
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