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WAEC Mathematics 2001 Question 22

Question 22

Graphs of Functions

The graph of the curve y = 2x2 − 5x − 1 and a straight line PQ were drawn to solve the equation 2x2 − 5x + 2 = 0. What is the equation of the line PQ?

  1. A.y = −1
  2. B.y = 1
  3. C.y = 3
  4. D.y = −3
Show the answer and explanation

Answer: D (y = −3)

Explanation

2x2 − 5x + 2 = 0 is the same as 2x2 − 5x − 1 = −3, so the line is y = −3.