Answer
-9$r^{3}$+5$r^{2}$+r-9
Work Step by Step
Given expression : (-9$r^{3}$h+2r-1)-(-5$r^{2}$+r+8)
Simplify parenthesis: -9$r^{3}$+2r-1+5$r^{2}$-r-8
Combine like terms: -9$r^{3}$+5$r^{2}$+r-9
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