$$m ^ { 4 } n - m n ^ { 4 }$$
$mn\left(m-n\right)\left(m^{2}+mn+n^{2}\right)$
$$mn\left(m^{3}-n^{3}\right)$$
$$\left(m-n\right)\left(m^{2}+mn+n^{2}\right)$$
$$mn\left(m-n\right)\left(m^{2}+mn+n^{2}\right)$$
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$mn\left(m^{3}-n^{3}\right)$
