$$n^{2}-\frac{6^{2}}{16}$$
$n^{2}-\frac{9}{4}$
$$n^{2}-\frac{36}{16}$$
$$n^{2}-\frac{9}{4}$$
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$\frac{\left(2n-3\right)\left(2n+3\right)}{4}$
$$\frac{4n^{2}-9}{4}$$
$$\left(2n-3\right)\left(2n+3\right)$$
$$\frac{\left(2n-3\right)\left(2n+3\right)}{4}$$
