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WAEC Mathematics 2018 Question 12

Question 12

Graphs of Functions

A curve is such that when y = 0, x = −2 or x = 3. Find the equation of the curve.

  1. A.y = x2 − 5x − 6
  2. B.y = x2 + 5x − 6
  3. C.y = x2 + x − 6
  4. D.y = x2 − x − 6
Show the answer and explanation

Answer: D (y = x2 − x − 6)

Explanation

y = (x + 2)(x − 3) = x² − x − 6.