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Math Help - x+xy and y+xy are perfect square, prove that x or y is perfect square.

  1. #1
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    x+xy and y+xy are perfect square, prove that x or y is perfect square.

    Hi,
    i have a problem and i couldn't solve it. help me plz:
    if x+xy and y+xy are perfect square, then prove that:
    x or y is perfect square

    for positive integers...
    Last edited by mr fantastic; July 22nd 2010 at 05:51 AM. Reason: Merged posts, re-titled.
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