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Evaluate the logarithm:

[tex]\log _5 \frac{1}{25}[/tex]

Answer :

We start by rewriting the argument of the logarithm:

[tex]$$
\frac{1}{25} = \frac{1}{5^2} = 5^{-2}.
$$[/tex]

Now, by the definition of logarithms, the expression

[tex]$$
\log_5 \left( 5^{-2} \right)
$$[/tex]

represents the exponent we need to raise 5 to in order to obtain [tex]$5^{-2}$[/tex]. Since [tex]$5^{-2}$[/tex] is already in exponential form, it follows directly that

[tex]$$
\log_5 \left( 5^{-2} \right) = -2.
$$[/tex]

Thus, the value of the logarithm is

[tex]$$
\boxed{-2}.
$$[/tex]

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