$$(5 { x }^{ 2 } +x-2) \times (2 { x }^{ 2 } -x+5)$$
$\left(2x^{2}-x+5\right)\left(5x^{2}+x-2\right)$
$$10x^{4}-3x^{3}+20x^{2}+7x-10$$
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$10x^{4}-3x^{3}+20x^{2}+7x-10$
