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OpenStudy (anonymous):
Is the product of a rational number and an irrational number necessarily rational? necessarily irrational? I'm having trouble with the word "necessarily". How can I prove this one way or the other?
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OpenStudy (anonymous):
it is irrational. 7 is rational , pi is irrational 7pi is irrational.
OpenStudy (tkhunny):
You can prove it if you know the same thing about the product of an integer and an irrational number.
OpenStudy (irishboy123):
.
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