JAMB - Mathematics (2018 - No. 39)

Evaluate log\(_2\) 8 – log\(_3\) \(\frac{1}{9}\)
-1 1\(\frac{1}{2}\)
-1
1
5

Explanation

log\(_2\) 8 – log\(_3\) \(\frac{1}{9}\)

  = log \(_2\) 2\(^3\) – log\(_3\) 9\(^{-1}\)

  = log\(_2\) 2\(^3\) – log\(_3\) 3\(^{-2}\)

  Based on law of logarithm

  = 3 log\(_2\) 2 – (-2 log\(_3\) 3)

  But log\(_2\) 2 = 1,

  log\(_3\) 3 = 1

  So, = 3 + 2

  = 5

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