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The graph of the relation y = x2 + 2x + k passes through the...

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
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Correct Answer: Option D
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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