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WAEC Further Mathematics 2018 Question 3

Question 3

Polynomials

Given that f(x) = 3x2 − 12x + 12 and f(x) = 3, find the values of x.

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

Answer: A (1, 3)

Explanation

3x² − 12x + 9 = 0 gives x² − 4x + 3 = 0, (x − 1)(x − 3) = 0: x = 1 or 3.