Answer
2$b^{3}$+13$b^{2}$+4b-2
Work Step by Step
(2$b^{3}$+5$b^{2}$-5b-8)+(8$b^{2}$+9b+6)
=2$b^{3}$+5$b^{2}$-5b-8+8$b^{2}$+9b+6
=2$b^{3}$+5$b^{2}$+8$b^{2}$-5b+9b-8+6
=2$b^{3}$+13$b^{2}$+4b-2
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