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The relation y = x2 + 2x + k passes through the point (2,0). Find...

Mathematics
WAEC 2016
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
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Correct Answer: Option A
Explanation
Y = x2 + 2x + k (given)

y = o when x = 2

thus 0 = 22 + 2 x 2 + k

0 = 4 + 4 + k

given k = -8
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