Answer
$10x\sqrt {5x}$
Work Step by Step
$3\sqrt {45x^3}+x\sqrt {5x}$ Factor.
$3\sqrt {9x^2}\cdot\sqrt {5x}+x\sqrt 5x$ Use the product rule and simplify.
$9x\sqrt {5x}+x\sqrt 5x$ Combine like radicals.
$10x\sqrt {5x}$
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