If the axis of symmetry of the parabola y = AX2 + BX + C (a ≠ 0) is a straight line x = 2 and the minimum value is - 2, then the root of the equation AX2 + BX + C = - 2 about X is______ .
Because if the axis of symmetry of the parabola y = AX2 + BX + C (a ≠ 0) is a straight line x = 2 and the minimum value is - 2, the vertex coordinates of the parabola are (2, - 2); when the root of the equation AX2 + BX + C = - 2 of X is y = - 2, the value of X is taken, so x = 2
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