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. \(y = 3x^{2} - 2x + 4\)
Correct Answer: D. \(y = 3x^{2} - 2x + 4\)
Explanation
The criterion for the quadratic curve to intersect the x- axis is \(b^{2} > 4ac\).
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