Answer
$-15x^{4}-18x^{3}+3x^{2}$
Work Step by Step
$-3x^{2}(5x^{2}+6x-1)$
=$-3x^{2}(5x^{2})-3x^{2}(6x)-3x^{2}(-1)$
=$-15x^{4}-18x^{3}+3x^{2}$
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