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)

View answer & explanation

Correct answer is D

x2 - x = x(x - 1)

= 2x2 + x - 1

= (2x - 1)(x + 10

x2 - 1 = (x + 1)(x - 1)

No factor

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