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2x^2-4x-4x+8=x^2-x+x-1
2x^2-8x+8=x^2-1
2x^2-8x-x^2= -1-8
x^2- 8x = -9
f) (6x+2)*1=(-1-3x)*(-2x-2)
6x+2=2x+2+6x^2+6x
6x+2=8x+2+6x^2
6x-8x-6x^2=2-2
-2x-6x^2=0