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Math Help - Proof Technique

  1. #1
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    Proof Technique

    Im having trouble with this proof:
    Let n be an integer, prove that if n^2 is divisible by three then n is divisible by three.
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  2. #2
    MHF Contributor Swlabr's Avatar
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    Quote Originally Posted by jsteel2 View Post
    Im having trouble with this proof:
    Let n be an integer, prove that if n^2 is divisible by three then n is divisible by three.
    Simply substitute in n:=3m, and evaluate using the fact that (ab)^x = a^xb^x.
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