JAMB - Mathematics (1980 - No. 16)
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)
설명
x2 - x = x(x - 1)
= 2x2 + x - 1
= (2x - 1)(x + 10
x2 - 1 = (x + 1)(x - 1)
No factor
= 2x2 + x - 1
= (2x - 1)(x + 10
x2 - 1 = (x + 1)(x - 1)
No factor