The graph of the relation y = x 2 + 2x + k passes through
MATHEMATICS
WAEC 2013
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
Correct Answer: D. -8
Explanation
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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