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GCE Mathematics 1990 Question 11

Question 11

Graphs of Functions

From the graph of y = 2x2 + x − 6, find the values of x for which y = 5

Diagram for this question
  1. A.−2.5, 2
  2. B.−2.6, 2.1
  3. C.−2.0, 1.5
  4. D.−2.0, 2.0
  5. E.0
Show the answer and explanation

Answer: B (−2.6, 2.1)

Explanation

Draw the line y = 5 and read where it meets the curve: about x = −2.6 and x = 2.1 (solving 2x2 + x − 11 = 0 gives −2.61 and 2.11).