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Find, without using logarithm tables, the value of \(\frac{log_3 27 - log_{\frac{1}{4}} 64}{log_3 \frac{1}{81}}\)

Mathematics
JAMB 1984

Find, without using logarithm tables, the value of \(\frac{log_3 27 - log_{\frac{1}{4}} 64}{log_3 \frac{1}{81}}\)

  • A. \(\frac{-3}{9}\)
  • B. \(\frac{-3}{2}\)
  • C. \(\frac{6}{11}\)
  • D. \(\frac{43}{78}\)
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Correct Answer: Option B
Explanation

\(\frac{\log_{3} 27 - \log_{\frac{1}{4}} 64}{\log_{3} (\frac{1}{81})}\)

\(\log_{3} 27 = \log_{3} 3^{3} = 3\log_{3} 3 = 3\)

\(\log_{\frac{1}{4}} 64 = \log_{\frac{1}{4}} (\frac{1}{4})^{-3} = -3\)

\(\log_{3} (\frac{1}{81}) = \log_{3} 3^{-4} = -4\)

\(\therefore \frac{\log_{3} 27 - \log_{\frac{1}{4}} 64}{\log_{3} (\frac{1}{81})} = \frac{3 - (-3)}{-4}\)

= \(\frac{6}{-4} = \frac{-3}{2}\)


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts