If x = 1 is a solution of the quadratic equation AX2 + bx-40 = 0 and a ≠ B, then the value of A2 − b22a − 2b is______ .

If x = 1 is a solution of the quadratic equation AX2 + bx-40 = 0 and a ≠ B, then the value of A2 − b22a − 2b is______ .

∵ x = 1 is a solution of the univariate quadratic equation AX2 + bx-40 = 0, ∵ x = 1 satisfies the univariate quadratic equation AX2 + bx-40 = 0, ∵ a + B-40 = 0, i.e. a + B = 40, ① A2 − b22a − 2B = (a + b) (a − b) 2 (a − b) = a + B2, i.e. A2 − b22a − 2B = a + B2, and ② substitutes ① into ② to obtain A2 − b22a − 2B = 20