Answer
$x^{6n+3}$
Work Step by Step
Using the law $a^{m}\times a^{n}=a^{m+n}$ to obtain:
$x^{6n-1}x^{4}$
$=x^{6n-1}\times x^{4}$
$=x^{6n-1+4}$
$=x^{6n+3}$
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