The graph of the relation y x2 2x k passes thro... - WAEC Mathematics 2013 Question
The graph of the relation y = x2 + 2x + k passes through the point (2, 0). Find the values of k
A
zero
B
-2
C
-4
D
-8
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Correct Option: D
y = x2 + 2x + k at point(2,0) x = 2, y = 0
0 = (2)2 + 2(20 + k)
0 = 4 + 4 + k
0 = 8 + k
k = -8
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