Answer
$-30x^{5n}$
Work Step by Step
Using the law $a^{m}\times a^{n}=a^{m+n}$ to obtain:
$(-6x^{2n+4})(5x^{3n-4})$
$=(-6\times 5)(x^{2n+4}\times x^{3n-4})$
$=(-30)(x^{2n+4+3n-4})$
$=-30x^{5n}$
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