Question on: JAMB Mathematics - 1991
Which of the following is a factor of rs + tr - pt - ps?
A
(p - s)
B
(s - p)
C
r - p)
D
r + p)
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Correct Option: C
rs + tr - pt - ps = rs - ps - tr - pt
= (r - p)s + (r - p)t
= (r - p)(s + t),
hence r - p is a factor
= (r - p)s + (r - p)t
= (r - p)(s + t),
hence r - p is a factor
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