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Exercise: Solve the following equation:
2 (mod 3)
We attempt to use the explicit formula for computing roots of congruence classes modulo a prime:
± (2)(3+1)/4 (mod 3)
± 2 (mod 3)
2 (mod 3)
Since the formula did not return a valid root, there is no solution; 2 is not a quadratic residue in ℤ/3ℤ