3x^2(x^2 - 4) - 2(a - 1)(a - 2) = 3x^2(x - 2)(x + 2) - 2(a - 1)(a - 2)4x^2 - 9 = (2x - 3)(2x + 3)x^3 - 8x^2 + 16x = x(x - 4)(x - 4)
3x^2(x^2 - 4) - 2(a - 1)(a - 2) = 3x^2(x - 2)(x + 2) - 2(a - 1)(a - 2)
4x^2 - 9 = (2x - 3)(2x + 3)
x^3 - 8x^2 + 16x = x(x - 4)(x - 4)