$$5 { x }^{ 4 } -10 { x }^{ 2 } =$$
$5x^{2}\left(x^{2}-2\right)$
$$5\left(x^{4}-2x^{2}\right)$$
$$x^{2}\left(x^{2}-2\right)$$
$$5x^{2}\left(x^{2}-2\right)$$
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