passwella.
Menu

UI Post-UTME Mathematics 2018 (Model questions) Question 11

Question 11

Indices

If 4x−1 = 8, find x

  1. A.2¼
  2. B.2½
  3. C.3
  4. D.5
Show the answer and explanation

Answer: B (2½)

Explanation

2^(2x − 2) = 2³, so 2x − 2 = 3 and x = 2½.