$$( 2 x + 3 ) ( 2 x - 3 ) ( 4 x ^ { 2 } - 9 )$$
$\left(4x^{2}-9\right)^{2}$
$$\left(4x^{2}-9\right)\left(4x^{2}-9\right)$$
$$\left(4x^{2}-9\right)^{2}$$
$$16\left(x^{2}\right)^{2}-72x^{2}+81$$
$$16x^{4}-72x^{2}+81$$
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$16x^{4}-72x^{2}+81$
