Answer
$4y^{2n}\cdot(2y^4+4y^3-3)$
Work Step by Step
$8y^{2n+4}+16y^{2n+3}-12y^{2n}=\\=4y^{2n}\cdot2y^4+4y^{2n}\cdot4y^3+4y^{2n}\cdot(-3)\\=4y^{2n}\cdot(2y^4+4y^3-3)$
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