Question on: WAEC Mathematics - 2005
Given that the root of an the equation (2x^2 + (k+2)x+k=0) is 2, find the value of k
A
-4
B
-2
C
-1
D
\(-\frac{1}{4}\)
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Correct Option: A
Substituting for x in the equation
(2(2)^2 + (k+2)2+k = 0 \Rightarrow 8 +2k + 4 + k =0 \Rightarrow 3k =-12; k=-4)
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