Answer
$-5$
Work Step by Step
$\lim _{x\rightarrow 3}\dfrac {-5x}{\sqrt {4x-3}}=\dfrac {-5\times 3}{\sqrt {4\times 3-3}}=\dfrac {-15}{\sqrt {12-3}}=-\dfrac {15}{\sqrt {9}}=-\dfrac {15}{3}=-5$
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