A curve is such that when y = 0, x = -2 or x =
MATHEMATICS
WAEC 2018
A curve is such that when y = 0, x = -2 or x = 3. Find the equation of the curve
- A. y = \(x^2 - 5x - 6\)
- B. y = \(x^2 + 5x - 6\)
- C. y = \(x^2 + x - 6\)
- D. y = \(x^2 - x - 6\)
Correct Answer: D. y = \(x^2 - x - 6\)
Explanation
Since the curve cuts the x-axis at x = -2 and x = 3,
(x + 2)(x - 3) = 0
\(x^2 - 3x + 2x - 6\) = 0
\(x^2 - x - 6\) = 0
Hence, the equation of the curve is
y = \(x^2 - x - 6\)
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