Answer
13$a^{2}$-6a-3
Work Step by Step
(8$a^{2}$+5a-9)+(5$a^{2}$-11a+6)
=8$a^{2}$+5a-9+5$a^{2}$-11a+6
=8$a^{2}$+5$a^{2}$+5a-11a-9+6
=13$a^{2}$-6a-3
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