I know this might be a stupid one, but could anyone explain the whole process for me, X^2= 7 (mod 3^3)
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$\displaystyle x^2 \equiv 7 \ (\text{mod } 27) $ $\displaystyle \Leftrightarrow x^2 \equiv 169 \ (\text{mod } 27)$ (adding the modulus to 7: 7 + 6(27) = 169) Why 169? 169 is a perfect square Does that help now?
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