What factor is common to all the expressions x2 – x, 2x2 + x – 1 and x2 – 1?
- x
- x + 1
- x - 1
-
No common factor
- (2x - 1)
The correct answer is: D
Explanation
x2 - x = x(x - 1)= 2x2 + x - 1
= (2x - 1)(x + 10
x2 - 1 = (x + 1)(x - 1)
No factor