Yashi1799 Yashi1799

23-08-2018
Mathematics

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

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sqdancefan sqdancefan

23-08-2018

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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