factorise x^3-6x^2+12x-8
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x^3-6^2+12x-8 =x^3-2x^2-4x^2+8x+4x-8 =x^2(x-2)-4x(x-2)+4(x-2) =(x^2-4x+4)(x-2) =(x-2)^2(x-2) =(x-2)^3
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