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WAEC - Mathematics (2007 - No. 48)
Which of the following is a factor of 2 - x - x
2
?
1 - x
1 + x
x - 1
2 - x
解释
2 - x - x
2
; (2 - 2x) + (x - x
2
)
= 2(1 - x) + x(1 - x)
= (1 - x)(2 + x)
= 1 - x
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