$$(-3) { \left(8a \right) }^{ 2 } (4b)$$
$-768ba^{2}$
$$-3\times 8^{2}a^{2}\times 4b$$
$$-3\times 64a^{2}\times 4b$$
$$-192a^{2}\times 4b$$
$$-768a^{2}b$$
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