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Which of the following quadratic curves will not intersect with the x- axis?

Further Mathematics
WAEC 2008

Which of the following quadratic curves will not intersect with the x- axis?

  • A. \(y = 2 - 4x - x^{2}\)
  • B. \(y = x^{2} - 5x -1\)
  • C. \(y = 2x^{2} - x - 1\)
  • D. \(y = 3x^{2} - 2x + 4\)
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Correct Answer: Option D
Explanation

The criterion for the quadratic curve to intersect the x- axis is \(b^{2} > 4ac\).

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