Answer
$\frac{y^8}{x^{13}}$
Work Step by Step
Use the product rule and the definition of negative exponents.
$y^8\times x^{-11}\times x^{-2}=y^8\times x^{-11+(-2)}=y^8\times x^{-13}=\frac{y^8}{x^{13}}$
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