Answer
2$y^3$(3y+7)(2y-3)
Work Step by Step
12$y^5$+10$y^4$-42$y^3$=2$y^3$(6$y^2$+5y-21)=2$y^3$[3y(2y-3)+7(2y-3)]=2$y^3$(3y+7)(2y-3)
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