The factors of 6x – 5 – x2 are

A.
(x + 3)(x + 2) 
B.
(x + 5)(x + 1) 
C.
(x – 5)(1 – x) 
D.
(x + 1)(x + 5)
Correct Answer: Option C
Explanation
6x – 5 – x2 = (1)(x2 – 5 + 6x)
= x2 – 6x + 5
= (x – 5)(x – 1)
(x – 1) = 1 – x
= (x – 5)(1 – x)
The factors of 6x – 5 – x2 are
6x – 5 – x2 = (1)(x2 – 5 + 6x)
= x2 – 6x + 5
= (x – 5)(x – 1)
(x – 1) = 1 – x
= (x – 5)(1 – x)