What factor is common to all the expressions x2 - x, 2x2 + x - 1 and x2 - 1?
A
x
B
x + 1
C
x - 1
D
No common factor
E
(2x - 1)
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
x2 - x = x(x - 1)
= 2x2 + x - 1
= (2x - 1)(x + 10
x2 - 1 = (x + 1)(x - 1)
No factor
Source: Myschool Past Questions Archive (Record #32620)