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a)x³+x²-x-1=x²(x+1)-1(x+1)=(x+1)(x²-1)=(x+1)(x-1)(x+1)
b)-4x³+x²+x-4=-4(x+1)(x²-x
+1)+x(x+1)=(x+1)(-4x²+4x-4+x)(x+1)(-4x²+5x+4)
c)2x³-3x²+6x-5=