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WAEC Mathematics 1995 Question 20

Question 20

Graphs of Functions

Use the graph of y = 3x2 + x − 7 to answer this question. What is the minimum value of y?

Diagram for this question
  1. A.−10
  2. B.−7
  3. C.−4
  4. D.−1
  5. E.2.
Show the answer and explanation

Answer: B (−7)

Explanation

The lowest point of the curve is just below the y-axis at about y = −7 (exactly −7 1/12 at x = −1/6).