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JAMB Mathematics 2003 Question 15

Question 15

Graphs of Functions

The graph of the function y = x2 + 4 and a straight line PQ are drawn to solve the equation x2 − 3x + 2 = 0. What is the equation PQ?

  1. A.y = 3x − 2
  2. B.y = 3x + 2
  3. C.y = 3x − 4
  4. D.y = 3x + 4
Show the answer and explanation

Answer: B (y = 3x + 2)

Explanation

x2 − 3x + 2 = 0 can be written x2 + 4 = 3x + 2, so the line is y = 3x + 2.