A) \[{{x}^{2}}-1\]
B) \[x+1\]
C) \[x-1\]
D) \[x+4\]
Correct Answer: C
Solution :
\[(x-1)-({{x}^{2}}-1)=-x(x-1)\] Hence, one of the factors of \[(x-1)({{x}^{2}}-1)\]is \[(x-1).\]
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