Answer
$log_a[\frac{25x^{6}}{\sqrt {2x+3}}]$
Work Step by Step
$2log_a(5x^3)-\frac{1}{2}log_a(2x+3)=log_a[\frac{5^2x^{6}}{(2x+3)^{1/2}}]=log_a[\frac{25x^{6}}{\sqrt {2x+3}}]$
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