Answer
$y^n(3+3y^n+5y^{7n})$
Work Step by Step
Factoring the $GCF=y^n$, then the factored form of the given expression, $
3y^n+3y^{2n}+5y^{8n}
$, is
\begin{array}{l}\require{cancel}
y^n(3+3y^n+5y^{7n})
.\end{array}
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