$$(3 { x }^{ 2 } +x-2) \times (5 { x }^{ 2 } -5x+0)$$
$5x\left(3x-2\right)\left(x^{2}-1\right)$
$$\left(3x^{2}+x-2\right)\left(5x^{2}-5x\right)$$
$$15x^{4}-10x^{3}-15x^{2}+10x$$
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$15x^{4}-10x^{3}-15x^{2}+10x$