$$729 k ^ { 4 } - 15625 z ^ { 4 }$$
$\left(27k^{2}-125z^{2}\right)\left(125z^{2}+27k^{2}\right)$
$$\left(27k^{2}-125z^{2}\right)\left(27k^{2}+125z^{2}\right)$$
$$\left(-125z^{2}+27k^{2}\right)\left(125z^{2}+27k^{2}\right)$$
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$729k^{4}-15625z^{4}$
