Answer
$12x^{7n}$
Work Step by Step
Using the law $a^{m}\times a^{n}=a^{m+n}$ to obtain:
$(-3x^{5n-2})(-4x^{2n+2})$
$=(-3\times -4)(x^{5n-2}\times x^{2n+2})$
$=(12)(x^{5n-2+2n+2})$
$=12x^{7n}$
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