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8 August, 06:48

The product of two positive integers is 120 one number is 2 less than five times the other

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  1. 8 August, 07:16
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    x, y - two positive integers

    product of two positive integers is 120

    (1) xy = 120

    one number is 2 less than five times the other

    (2) x = 5y - 2 substitute it to (1)

    (5y - 2) y = 120 use distributive property

    (5y) (y) - (2) (y) = 120

    5y² - 2y = 120 subtract 120 from both sides

    5y² - 2y - 120 = 0

    use quadratic formula

    a = 5, b = - 2, c = - 120

    b² - 4ac = (-2) ^2 - 4 (5) (-120) = 4 + 2400 = 2404

    √2404 is irrational number, therefore

    Answer: no solution in integer numbers
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