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Which of the following is a factor of 2 - x - x2?

Mathematics
WAEC 2007
Which of the following is a factor of 2 - x - x2?
  • A. 1 - x
  • B. 1 + x
  • C. x - 1
  • D. 2 - x
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Correct Answer: Option A
Explanation
2 - x - x2; (2 - 2x) + (x - x2)

= 2(1 - x) + x(1 - x)

= (1 - x)(2 + x)

= 1 - x
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