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Simplify 2log \(\frac{2}{5}\) - log\(\frac{72}{125}\) + log 9

Mathematics
JAMB 1991

Simplify 2log \(\frac{2}{5}\) - log\(\frac{72}{125}\) + log 9
  • A. 1 - 4 log3
  • B. -1 + 2 log 3
  • C. -1 + 5 log2
  • D. 1 - 2log 2
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Correct Answer: Option D
Explanation
2log \(\frac{2}{5}\) - log\(\frac{72}{125}\) + log 9

[\(\frac{2}{5}\))2 x 9] = log \(\frac{4}{25}\) x \(\frac{9}{1}\) x \(\frac{125}{72}\)

= log \(\frac{72}{125}\)

= log \(\frac{5}{2}\)

= log \(\frac{10}{4}\)

= log 10 - log 4

= log10 10 - log10 22

= 1 - 2 log2

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