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WAEC Mathematics 2014 Question 27

Question 27

Graphs of Functions

The graph is for the relation y = 2x2 + x − 1. What are the coordinates of the point S?

Diagram for this question
  1. A.(1, 0.2)
  2. B.(1, 0.4)
  3. C.(1, 2.0)
  4. D.(1, 4.0)
Show the answer and explanation

Answer: C ((1, 2.0))

Explanation

All options have x = 1. On the curve, y = 2(1)2 + 1 − 1 = 2, so S is (1, 2.0).