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2x²-2[3x-2(-x²+2x-1)-4]
=2x²-2(3x+2x²-4x+2-4)
=2x²-6x-4x²+8x-4+8
=(2-4)x²+(-6+8)x+(-4+8)
=-2x²+2x+4
=-2(x²-x-2)
=-2(x+1)(x-2)
=2x²-2(3x+2x²-4x+2-4)
=2x²-6x-4x²+8x-4+8
=(2-4)x²+(-6+8)x+(-4+8)
=-2x²+2x+4
=-2(x²-x-2)
=-2(x+1)(x-2)
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