Question on: JAMB Mathematics - 1993
Which of the following is a factor of 15 + 7x - 2x2
A
x + 3
B
x - 3
C
x - 5
D
x + 5
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Correct Option: C
Factorize 15 + 7x - 2x2
(5 - x)(3 + 2x); suppose 15 + 7x = 2x2 = 0
∴ (5 - x)(3 + 2x) = 0
x = 5 or x = -(\frac{3}{2})
Since 5 is a root, then (x - 5) is a factor
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