Given the set a =, B =, and the intersection of a and B =, then the real number a=

Given the set a =, B =, and the intersection of a and B =, then the real number a=

There are two cases: A ^ 2 + A-4 = 2; a ^ 2 + 1 = 3; a ^ 2 + A-4 ≠ a ^ 2 + 1; 2A + 1 ≠ - 2; a ^ 2 + A-4 ≠ - 2; a ^ 2 + 1 ≠ - 2; a ^ 2 + A-4 ≠ 3; a ^ 2 + A-4 ≠ 2A + 1; 2A + 1 ≠ - 2; a ^ 2 + A-4 ≠ - 2; a ^ 2 + 1 ≠ - 2