I need help to solve the following problem. See below for attachment Thanks
Last edited by mr fantastic; Feb 13th 2010 at 03:56 PM. Reason: Re-inforced the edit made by the OP to post title
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Have you tried using the hint? If x is even then $\displaystyle x^2$ is congruent to 0 (mod 4). If x is odd then $\displaystyle x^2$ is congruent to 1 (mod 4).
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