Which of the following is a factor of 2 – x – x2?
-
1 - x
- 1 + x
- x - 1
- 2 - x
The correct answer is: A
Explanation
2 - x - x2; (2 - 2x) + (x - x2)= 2(1 - x) + x(1 - x)
= (1 - x)(2 + x)
= 1 - x