$$(5ix-6)(3x+4)$$
$15ix^{2}+\left(-18+20i\right)x-24$
$$15ix^{2}+20ix-18x-24$$
$$15ix^{2}+\left(-18+20i\right)x-24$$
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$\left(5ix-6\right)\left(3x+4\right)$