Solve the problem down below & simplify the final answer.

Explanation:
[tex]\begin{gathered} 3\log_a4\text{ -4}\log_a5 \\ Using\text{ the power rule:} \\ =\log_a4^3\text{ -}\log_a5^4 \\ Using\text{ the quotient rule} \\ =\log_a(\frac{64}{625}) \\ \end{gathered}[/tex]