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