2008
Mathematics
JAMB
If 2x2 - kx - 12 is divisible by x-4, Find the value of k
A.
4
B.
5
C.
6
D.
7
Correct Answer: 5
Explanation
2x2 - kx - 12 is divisible by x-4 implies x is a factor ∴ x = 4 f(4) implies 2(4)2 - k(4) - 12 = 0 32 - 4k - 12 = 0 -4k + 20 = 0 -4k = -20 k = 5
2x2 - kx - 12 is divisible by x-4 implies x is a factor ∴ x = 4 f(4) implies 2(4)2 - k(4) - 12 = 0 32 - 4k - 12 = 0 -4k + 20 = 0 -4k = -20 k = 5THIS WEEK's
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