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WAEC Mathematics 2011 Question 30

Question 30

Graphs of Functions

The graph represents the relation y = x2 − 3x − 3. What is the equation of the line of symmetry of the graph?

Diagram for this question
  1. A.y = 0.5
  2. B.x = 1.0
  3. C.x = 1.5
  4. D.y = 4.6
Show the answer and explanation

Answer: C (x = 1.5)

Explanation

The line of symmetry passes through the lowest point, x = −b/2a = 3/2 = 1.5.