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WAEC Mathematics 2004 Question 40

Question 40

Graphs of Functions

Use the graph of y = x2 + 3x − 4. What are the roots of the equation x2 + 3x − 4 = 0?

Diagram for this question
  1. A.1, 4
  2. B.−1, −4
  3. C.−1, 4
  4. D.−4, 1
Show the answer and explanation

Answer: D (−4, 1)

Explanation

The curve crosses the x-axis at x = −4 and x = 1 (check: (x + 4)(x − 1) = x2 + 3x − 4).