Which of the following is a factor of 2 - x - x2 - WAEC Mathematics 2007 Question
Which of the following is a factor of 2 - x - x2?
A
1 - x
B
1 + x
C
x - 1
D
2 - x
correct option: a
2 - x - x2; (2 - 2x) + (x - x2)
= 2(1 - x) + x(1 - x)
= (1 - x)(2 + x)
= 1 - x
= 2(1 - x) + x(1 - x)
= (1 - x)(2 + x)
= 1 - x
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