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WAEC Mathematics 2009 Question 11

Question 11

Graphs of Functions

The following is the graph of a quadratic function. Find the values of x when y = 0.

Diagram for this question
  1. A.1, 3
  2. B.1, 4
  3. C.2, 3
  4. D.1, 6
Show the answer and explanation

Answer: B (1, 4)

Explanation

The curve cuts the x-axis at x = 1 and x = 4 (x2 − 5x + 4 = (x − 1)(x − 4)).