Answer
-3$z^{3}$-2$z^{2}$-10z+1
Work Step by Step
(3$z^{2}$-8z+5)+(-3$z^{3}$-5$z^{2}$-2z-4)
=3$z^{2}$-8z+5-3$z^{3}$-5$z^{2}$-2z-4
=-3$z^{3}$+3$z^{2}$-5$z^{2}$-8z-2z+5-4
=-3$z^{3}$-2$z^{2}$-10z+1
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