When x = 1, the value of the algebraic expression ax3-bx + 1 is equal to - 17, then when x = - 1, the value of the algebraic expression ax3-bx + 1 is equal to -______ .

When x = 1, the value of the algebraic expression ax3-bx + 1 is equal to - 17, then when x = - 1, the value of the algebraic expression ax3-bx + 1 is equal to -______ .

When ∵ x = 1, the value of the algebraic formula ax3-bx + 1 is equal to - 17, substituting x = 1 into A-B + 1 = - 17, ∵ A-B = - 18, substituting x = - 1 into ax3-bx + 1 according to the meaning of the question to get: - A + B + 1 = - (a-b) + 1 = - (- 18) + 1 = 19