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