Answer :
[tex]\bf \textit{Logarithm Cancellation Rules}
\\\\
\boxed{log_a a^x = x}\qquad \qquad a^{log_a x}=x\\\\
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log_5(125)\qquad \qquad \underline{125=5^3}\qquad \qquad log_5(\underline{5^3})\implies 3[/tex]
\\\\
\boxed{log_a a^x = x}\qquad \qquad a^{log_a x}=x\\\\
-------------------------------\\\\
log_5(125)\qquad \qquad \underline{125=5^3}\qquad \qquad log_5(\underline{5^3})\implies 3[/tex]