Answer
-20$y^{3}$+12$y^{2}$-4
Work Step by Step
(10$y^{2}$-7)-(20$y^{3}$-2$y^{2}$-3)
=10$y^{2}$-7-20$y^{3}$+2$y^{2}$+3
=-20$y^{3}$+10$y^{2}$+2$y^{2}$-7+3
=-20$y^{3}$+12$y^{2}$-4
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