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posted by  Tanya_725 on 1/17/2008 10:35:02 PM  |  status: Live  

Please help! (rational & irrational #)

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Prove that if r is rational (r is not equal to 0) and x is irrational, then (r + x) and rx are irrational.
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posted by miss.bossyy on 1/17/2008 10:40:31 PM  |  status: Live
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Tanya_725's comment:
"Thank u! Thank u! Thank u!"
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posted by miss.bossyy on 1/17/2008 10:51:32 PM  |  status: Live
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Tanya_725's comment:
"Thank u soooooooo much!"
Response Details:
and sorry for second part:    Let a = 0.  Then a/b = 0, and so a/b * x = 0, which is rational.  Now assume that a is not 0.  And then go on with your proof.
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