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