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5 March, 11:17

The square of a number is 15 more than 2 times the number

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  1. 5 March, 14:34
    0
    x^2 = 2x + 15

    x^2 - 2x - 15 = 0

    Factor:

    (x-5) (x+3) = 0

    x = 5 or x = - 3
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