`(x^3-x^2)-4x^2+8x-4`
`=x^2(x-1)-4(x^2-2x+1)`
`=x^2(x-1)-4(x-1)^2`
`=(x-1)[x^2-4(x-1)]`
`=(x-1)(x^2-4x+4)`
`=(x-1)(x-2)^2`
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`(x-3)^3+(3-x)`
`=(x-3)^3-(x-3)`
`=(x-3)[(x-3)^2-1]`
`=(x-3)(x-3-1)(x-3+1)`
`=(x-3)(x-4)(x-2)`