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WAEC Further Mathematics 2016 Question 5

Question 5

Functions

If f(x) = 4/x − 1, x ≠ 0, find f−1(7)

  1. A.−3/7
  2. B.0
  3. C.½
  4. D.4
Show the answer and explanation

Answer: C (½)

Explanation

Solve 4/x − 1 = 7: 4/x = 8, so x = ½.