$$(2 { x }^{ 2 } -5x+9)(5 { x }^{ 2 } -2x-8)$$
$\left(5x^{2}-2x-8\right)\left(2x^{2}-5x+9\right)$
$$10x^{4}-29x^{3}+39x^{2}+22x-72$$
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$10x^{4}-29x^{3}+39x^{2}+22x-72$