If the equation x3-x + 1 = 0 has exactly one zero point in the interval (a, b) (a, B are integers and B-A = 1), then a + B=______ .

If the equation x3-x + 1 = 0 has exactly one zero point in the interval (a, b) (a, B are integers and B-A = 1), then a + B=______ .

Let f (x) = x3-x + 1, and substitute x = - 2, 0, 1, 2 into the verification, which is known from the existence theorem of zero point. If f (a) · f (b) < 0, then the zero point is calculated in (a, b), then f (- 2) < 0, f (- 1) > 0, so the zero point is in (- 2, - 1), then a + B = - 3, so the answer is - 3