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melomori [17]
3 years ago
8

Evaluate the log without a calculator ( Show your work )

mula1" title="log_{81} 27" alt="log_{81} 27" align="absmiddle" class="latex-formula">
Mathematics
2 answers:
mamaluj [8]3 years ago
5 0

Answer:

3/4 ( or 0.75).

Step-by-step explanation:

let y = log81 27, then:

27 = 81^y     ( by the definition of a logarithm).

27 = 3^3 and 81 = 3^4

So 27 =  81 ^3/4

so y = log81 27 = = 3/4.

OLEGan [10]3 years ago
4 0

Answer:

\log_{81}(27)=\frac{3}{4}

Step-by-step explanation:

The given logarithm is

\log_{81}(27)

Let us change to base 3.

\log_{81}(27)=\frac{\log_3(27)}{\log_3(81)}

\log_{81}(27)=\frac{\log_3(3^3)}{\log_3(3^4)}

\log_{81}(27)=\frac{3\log_3(3)}{4\log_3(3)}

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

\log_{81}(27)=\frac{3}{4}

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