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WAEC Mathematics 2002 Question 10

Question 10

Graphs of Functions

The diagram is the graph of y = 6 + x − x2. When y = 3 1/2, what is the positive value of x?

Diagram for this question
  1. A.2 1/2
  2. B.2 1/5
  3. C.1 1/5
  4. D.0
Show the answer and explanation

Answer: B (2 1/5)

Explanation

Solve 6 + x − x2 = 3.5: x2 − x − 2.5 = 0 gives x ≈ 2.16, which reads as about 2 1/5 on the graph.