Answer
$2x^{3n}y^{n-2}$
Work Step by Step
RECALL:
$a^m \cdot a^n = a^{m+n}$
Multiply the coefficients together then use the rule above to the variables to obtain:
$=\frac{8}{4}x^{2n+n}y^{n-5+3}
\\=2x^{3n}y^{n-2}$
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