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JAMB Mathematics 2012 Question 7

Question 7

Logarithms

If log3x2 = −8, what is x?

  1. A.1/3
  2. B.1/9
  3. C.1/27
  4. D.1/81
Show the answer and explanation

Answer: D (1/81)

Explanation

x2 = 3−8, so x = 3−4 = 1/81.