Answer
$x^{4n-2}$
Work Step by Step
Using the law $a^{m}\times a^{n}=a^{m+n}$ to obtain:
$x^{3}x^{4n-5}$
$=x^{3}\times x^{4n-5}$
$=x^{3+4n-5}$
$=x^{4n-2}$
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