$$9r^{2}-s^{2}-6s-9$$
$\left(3r-s-3\right)\left(3r+s+3\right)$
$$9r^{2}-\left(s^{2}+6s+9\right)$$
$$\left(3r\right)^{2}-\left(3+s\right)^{2}$$
$$\left(3r-3-s\right)\left(3r+3+s\right)$$
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$-\left(s+3\right)^{2}+9r^{2}$
