Proof by contradiction
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Re: Proof by contradiction
Well, a^2b^2 = (a+b)(ab), right? Then consider the cases of a and b even, and a and b odd (if only one is even, then the left side is odd and the right side is even, a contradiction). You'll find that (a+b) is even AND (ab) is ALSO even, and thus the left side is divisible by four, while the right side cannot be divisible by four. Again, contradiction.

Re: Proof by contradiction
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Re: Proof by contradiction
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Re: Proof by contradiction
Thanks. I tried this before but I must have messed up the algebra or something

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