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(x-4)(x-4-2V3)(x-4+2V3)
(x-4) [(x-4)²-(2V3)²]
(x-4) [(x-4)²- 12 ]
(x-4)( x²-8x+16 -12)
(x-4)(x²-8x+4)
x^3 -8x²+4x-4x²+32x-16
x^3-12x²+36x-16
(x-4)(x-4-2V3)(x-4+2V3)
(x-4) [(x-4)²-(2V3)²]
(x-4) [(x-4)²- 12 ]
(x-4)( x²-8x+16 -12)
(x-4)(x²-8x+4)
x^3 -8x²+4x-4x²+32x-16
x^3-12x²+36x-16