The graph of the curve \(y = 2x^2 - 5x - 1\) and a straight line PQ were drawn to solve the equation \(2x^2 - 5x + 2 = 0\)

What is the equation of the straight line PQ?

  • A y = -1
  • B y = 1
  • C y = 3
  • D y = -3
waec 2001mathematics

The correct answer is D. y = -3

Let the straight line PQ = y

2x\(^2\) - 5x - 1 - y = 2x\(^2\) - 5x + 2

y = 2x\(^2\) - 5x - 1 - 2x\(^2\) + 5x - 2 

y = -3

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