$$2 { x }^{ 2 } -8 { y }^{ 2 }$$
$2\left(x-2y\right)\left(x+2y\right)$
$$2\left(x^{2}-4y^{2}\right)$$
$$\left(x-2y\right)\left(x+2y\right)$$
$$2\left(x-2y\right)\left(x+2y\right)$$
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$2\left(x^{2}-4y^{2}\right)$
