$$12 { a }^{ 3 } { y }^{ 2 } +45 { a }^{ 2 } y=$$
$3ya^{2}\left(4ay+15\right)$
$$3\left(4a^{3}y^{2}+15a^{2}y\right)$$
$$a^{2}y\left(4ay+15\right)$$
$$3a^{2}y\left(4ay+15\right)$$
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