3(2x)(x-1)-(x-2)^2
3(2x)(x-1)-(x-2)^2=6x(x-1)-(x²-4x+4)=6x²-6x-x²+4x-4=5x²-2x-4
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3(2x)(x-1)-(x-2)^2=6x(x-1)-(x²-4x+4)=6x²-6x-x²+4x-4=5x²-2x-4