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exspiro exspiro
 

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M$1.00  Funded By Mahalo ? |  March 23, 2009 02:50 AM

If x and y are irrational and positive, then is x*y irrational?

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chazzyfen chazzyfen
 
 March 23, 2009 03:04 AM
Sometimes, but not always. For example, if x equals the square root of 2 and y equals the square root of 32, then x*y=8, which is rational. However, if y were instead to equal the square root of 3, then x*y=sqrt6, which is irrational. Most of the time the answer will be irrational, though.


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elly2222 elly2222
 
March 23, 2009 03:04 AM
No, not necessarily. For example sqrt(2) and sqrt(8) are both irrational and positive, but:
sqrt(2)*sqrt(8) = 4

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