$$(3 { x }^{ 2 } +2x-3) \times (5 { x }^{ 2 } -4x+3)$$
$\left(3x^{2}+2x-3\right)\left(5x^{2}-4x+3\right)$
$$15x^{4}-2x^{3}-14x^{2}+18x-9$$
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$15x^{4}-2x^{3}-14x^{2}+18x-9$