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