An equation of the form ax^2 + bx + c ≡ 0 (mod m), where a, b, and c are integers, and m is a positive integer, is known as a quadratic congruence.
An equation of the form ax^2 + bx + c ≡ 0 (mod m), where a, b, and c are integers, and m is a positive integer, is known as a quadratic congruence.