Answer
$1 5x^{6}y^{4}$.
Work Step by Step
The given expression is
$=3x^2y(5x^4y^3)$
Use the product rule to add exponents.
$=3\cdot 5x^{2+4}y^{1+3}$
Simplify.
$=1 5x^{6}y^{4}$.
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