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Evaluate \(\frac{2\log_{3} 9 \times \log_{3} 81^{-2}}{\log_{5} 625}\)

Mathematics
JAMB 2019

Evaluate \(\frac{2\log_{3} 9 \times \log_{3} 81^{-2}}{\log_{5} 625}\)

  • A. 4
  • B. -32
  • C. -8
  • D. 16
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Correct Answer: Option C
Explanation

\(\frac{2\log_{3} 9 \times \log_{3} 81^{-2}}{\log_{5} 625}\)

= \(\frac{2\log_3 3^2 \times \log_3 (3^4)^{-2}}{\log_5 (5^4)}\)

= \(\frac{4\log_3 3 \times -8\log_3 3}{4\log_5 5}\)

= -8.

There is an explanation video available below.


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