Determine which of the congruences has a solution and why

Reference no: EM13187989

Determine which of the congruences has a solution and why? (Give explanation).

(i) x^2 = -1 mod 5987
(ii) x^2 = 6780 mod 6781
(iii) x^2 + 14x - 35 = 0 mod 337
(iv) x^2 - 64x + 943 = 0 mod 3011

Reference no: EM13187989

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