The absolute value of 3A + 2B + 1 + (3a-2b-1) square = 0, find the value of a + 2Ab + B, please 3Q

The absolute value of 3A + 2B + 1 + (3a-2b-1) square = 0, find the value of a + 2Ab + B, please 3Q

3A + 2B = - 1 3a-2b = 1 a = 0 B = - 0.5, so the original formula = (a + b) = 1 / 4 = 0.25