$$(8z-\sqrt{d})(8z+\sqrt{d}).$$
$64z^{2}-d$
$$\left(8z\right)^{2}-\left(\sqrt{d}\right)^{2}$$
$$8^{2}z^{2}-\left(\sqrt{d}\right)^{2}$$
$$64z^{2}-\left(\sqrt{d}\right)^{2}$$
$$64z^{2}-d$$
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$128z$
