Solve the equation 5×2 – 4x – 1 = 0

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Mathematics WAEC 1998

Solve the equation 5x2 – 4x – 1 = 0

  • -1, 1/5
  • -1, -1/5
  • 1, 1/5
  • 1, -1/5 checkmark
  • -1, 5

The correct answer is: 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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