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Solve the equation 5x2 - 4x - 1 = 0

Mathematics
WAEC 1998
Solve the equation 5x2 - 4x - 1 = 0
  • A. -1, 1/5
  • B. -1, -1/5
  • C. 1, 1/5
  • D. 1, -1/5
  • E. -1, 5
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Correct Answer: Option D
Explanation
5x2 - 4x - 1 = 0
5x2 5x + x -1 = 0
5x(x - 1) + (x - 1) = 0
(5x + 1)(x -1) = 0
x = -1/5 or 1 = 0
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