Assignment:
Find all solutions of each of the following congruences .
(a) x2 + x +1 ≡ 0 (mod 11)
(b) x3 + x + 1 ≡ 0 (mod 13)
(c) x4 + x3 + 2 ≡ 0 (mod 7)
Provide complete and step by step solution for the question and show calculations and use formulas.