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