## stuck-help one year ago which expression is equevalent to in comments

1. stuck-help

$3x \left( -4x ^{2}-5x-8 \right)-6\left( x ^{2-5x+7} \right)$ equevalent to

2. stuck-help

A $12x ^{3-9x ^{2}}+6x-42$ B $-12x ^{3}+9x ^{2}+6x-42$ C $-12x ^{3}-54x ^{2}+6x-42$ D $-27x ^{3}-6x ^{2}+6x-42$