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November 5th, 2008, 07:26 AM   #1
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urgent help

need some help with this question

Let (a,b)=1 and ab=c^2. Show that a and b are perfect squares.

Thank you
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November 5th, 2008, 12:32 PM   #2
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Re: urgent help

Write a and b in the form x^2 * y with (x, y) = 1. The result follows pretty quickly.
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November 5th, 2008, 11:51 PM   #3
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Re: urgent help

How can I write them in this form? Using prime factorization? Thx
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