JAMB - Mathematics (1982 - No. 5)
The factors of 6x - 5 - x2 are
-(x + 3)(x + 2)
(x + 5)(x + 1)
(x - 5)(1 - x)
(x + 1)(x + 5)
Explanation
6x - 5 - x2 = (-1)(-x2 - 5 + 6x)
= x2 - 6x + 5
= (x - 5)(x - 1)
-(x - 1) = 1 - x
= (x - 5)(1 - x)
= x2 - 6x + 5
= (x - 5)(x - 1)
-(x - 1) = 1 - x
= (x - 5)(1 - x)
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