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WAEC Mathematics 2004 Question 41

Question 41

Graphs of Functions

Use the graph of y = x2 + 3x − 4. The values of x when y = 3 are approximately

Diagram for this question
  1. A.−4.7 and 1.4
  2. B.−4.6 and 1.5
  3. C.−3.6 and 0.4
  4. D.−3.6 and 1.5.
Show the answer and explanation

Answer: B (−4.6 and 1.5)

Explanation

Draw y = 3 across the graph; it meets the curve at about −4.6 and 1.5 (x2 + 3x − 7 = 0).