The relation y x2 2x k passes through the point... - WAEC Mathematics 2016 Question
The relation y = x2 + 2x + k passes through the point (2,0). Find the value of k
A
- 8
B
- 4
C
4
D
8
correct option: a
Y = x2 + 2x + k (given)
y = o when x = 2
thus 0 = 22 + 2 x 2 + k
0 = 4 + 4 + k
given k = -8
y = o when x = 2
thus 0 = 22 + 2 x 2 + k
0 = 4 + 4 + k
given k = -8
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