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WAEC Further Mathematics 2016 Question 6

Question 6

Functions

If y = 4x − 1, list the range of the domain {−2 ≤ x ≤ 2}, where x is an integer.

  1. A.{−9, −1, 2, 3, 4}
  2. B.{−9, −2, 0, 1, 7}
  3. C.{−5, −4, −3, −2}
  4. D.{−9, −5, −1, 3, 7}
Show the answer and explanation

Answer: D ({−9, −5, −1, 3, 7})

Explanation

x = −2, −1, 0, 1, 2 give y = −9, −5, −1, 3, 7.