Answer
8$z^{2}$-6.1z+17.3
Work Step by Step
(-$z^{2}$-4.2z+11)+(9$z^{2}$-1.9z+6.3)
=-$z^{2}$-4.2z+11+9$z^{2}$-1.9z+6.3
=8$z^{2}$-6.1z+17.3
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