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The graph is that of the quadratic expression

Mathematics
WAEC 1998

The graph is that of the quadratic expression

  • A. \(y=x^2 + x - 2\)
  • B. \(y=x^2 - x + 2\)
  • C. \(y=x^2 - x - 2\)
  • D. \(y=x + x + 2\)
  • E. \(y=x^2 - 2 x - 2\)
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Correct Answer: Option C
Explanation

The curve cuts the x-axis at x = -1 and x = 2

(x + 1)(x - 2) = 0

x\(^2\) - 2x + x - 2 = 0

x\(^2\) - x - 2 = 0

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