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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 = \(x^2 - x - 6\)
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Correct Answer: Option D
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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