Which of the following is a factor of rs + tr - pt - ps?
A
(p - s)
B
(s - p)
C
r - p)
D
r + p)
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
rs + tr - pt - ps = rs - ps - tr - pt
= (r - p)s + (r - p)t
= (r - p)(s + t),
hence r - p is a factor
Source: Myschool Past Questions Archive (Record #31406)