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9 September, 16:27

The square of 9 more than a number is equal to 9 more than the square of the number. what is the number?

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  1. 9 September, 19:51
    0
    (x+9) ^2 = x^2 + 9

    x^2 + 18x + 81 = x^2 + 9

    18x = - 72

    x = - 4
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