Answer
-11$z^{2}$-3z-1
Work Step by Step
(-3$z^{2}$+5z-5)+(-8$z^{2}$-8z+4)
=-3$z^{2}$+5z-5-8$z^{2}$-8z+4
=-3$z^{2}$-8$z^{2}$+5z-8z-5+4
=-11$z^{2}$-3z-1
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