$$y ^ { 2 } + 16 y + 64 - z ^ { 2 }$$
$\left(-y-z-8\right)\left(-y+z-8\right)$
$$\left(8+y-z\right)\left(8+y+z\right)$$
$$\left(y-z+8\right)\left(y+z+8\right)$$
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$\left(y+8\right)^{2}-z^{2}$
