Sunday, June 30, 2019

Expanding logarithms


            Logarithm rules
            1) loga(mn) = loga(m) + loga(n)
2) loga(m/n) = loga(m) – loga(n)
3) loga(mn) = n · loga(m)

       Example 1
              log3(5x)=?
          Solution
              log3(5x) = log3(5) + log3(x)
      Example 2
           log4( 3/x )=?
         Solution
           log4( 3/x ) = log4(3) – log4(x)
      Example 3
           log5(x4)=?
         Solution
         log5(x4) = 4 · log5(x) = 4log5(x)
      Example 4
            Log2( 3a/7x )=?
         Solution
           Log2( 3a/7x )= log2(3a ) -  log2(7x)= 
                              = log2( 3) + log2(a ) – log2(7) – log2(x )

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