Which of the following congruences have solutions?
x^2 congruent to 8 (mod 53)
x^2 congruent to 15 (mod 31)
x^2 congruent to 54 (mod 7)
x^2 congruent to 625 (mod 9973)
can someone explain how do you tell if a congruence hasno solution? you.
(this comes as a single questions in the book, i am not tryingto ask multiple questions in one post. if this is stillbreaking the rules, i appologize for that).