$$(3 { x }^{ 2 } +3x-4) \times (3 { x }^{ 2 } -5x+5)$$
$\left(3x^{2}-5x+5\right)\left(3x^{2}+3x-4\right)$
$$9x^{4}-6x^{3}+35x-12x^{2}-20$$
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$9x^{4}-6x^{3}-12x^{2}+35x-20$