$$( 3 a - 2 b ) ^ { 2 } - ( 2 a - 3 b ) ^ { 2 }$$
$5\left(a^{2}-b^{2}\right)$
$$9a^{2}-12ab+4b^{2}-\left(2a-3b\right)^{2}$$
$$9a^{2}-12ab+4b^{2}-\left(4a^{2}-12ab+9b^{2}\right)$$
$$9a^{2}-12ab+4b^{2}-4a^{2}+12ab-9b^{2}$$
$$5a^{2}-12ab+4b^{2}+12ab-9b^{2}$$
$$5a^{2}+4b^{2}-9b^{2}$$
$$5a^{2}-5b^{2}$$
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$5a^{2}-5b^{2}$
