$$2 a + 3 b - 4 c , 3 a + 4 b + 2 c$$
$-\left(2a+3b-4c\right)\left(3a+4b+2c\right)$
$$-\left(2a+3b-4c\right)\left(3a+4b+2c\right)$$
$$-6a^{2}-17ab+8ac-12b^{2}+10bc+8c^{2}$$
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$2a+3b-4c,3a+4b+2c$
