12x2+8x-3xy-2y ﹙x²+1﹚²-4x﹙x+1﹚+4x²

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12x2+8x-3xy-2y ﹙x²+1﹚²-4x﹙x+1﹚+4x²
12x2+8x-3xy-2y ﹙x²+1﹚²-4x﹙x+1﹚+4x²

12x2+8x-3xy-2y ﹙x²+1﹚²-4x﹙x+1﹚+4x²
12x2+8x-3xy-2y
=4x(3x+2)-y(3x+2)
=(3x+2)(4x-y)
﹙x²+1﹚²-4x﹙x+1﹚+4x²
=(x²+1-2x)²
=(x-1)^4