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13 July, 04:01

1:X = X:81 what number can replace X?

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  1. 13 July, 04:23
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    Multiply 1/x = x/81 by 81x and you get

    ... 81 = x²

    Taking the square root gives

    ... x = ±9

    Either 9 or - 9 can replace X to make the proportion statement true.
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