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 July 30th, 2012, 08:45 PM #1 Member   Joined: May 2012 From: Vietnam Posts: 73 Thanks: 0 Integer Find all integer numbers $x,y$ such that $0 \le 2x^2+4xy+5y^2+2xy+z^2-2xz \le 1$
 July 30th, 2012, 11:42 PM #2 Member   Joined: May 2012 From: Chennai,India Posts: 67 Thanks: 0 Re: Integer $\text{Can you check the question again? There are 2 terms in xy (4xy and 2xy).}$ $\text{just to ensure that it isn't a typo..}$ $\text{Is z an integer also? If yes, then your question is the expression equal to 1 or 0.??}$

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