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WAEC Mathematics 1998 Question 24

Question 24

Graphs of Functions

Use the graph to answer this question. The values of x when y = −1 are approximately

Diagram for this question
  1. A.−1.0 and 2.0
  2. B.−1.3 and 2.3
  3. C.−0.6 and 2.6
  4. D.−0.6 and 1.6
  5. E.1.6 and 1.6.
Show the answer and explanation

Answer: D (−0.6 and 1.6)

Explanation

Draw the line y = −1 across the graph; it meets the curve at about x = −0.6 and x = 1.6 (x2 − x − 1 = 0).