Evaluate
5n^{3}-n^{2}-9n+15
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5n^{3}-n^{2}-9n+15
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8n^{3}-9n+6-3n^{3}-n^{2}+9
To find the opposite of 3n^{3}+n^{2}-9, find the opposite of each term.
5n^{3}-9n+6-n^{2}+9
Combine 8n^{3} and -3n^{3} to get 5n^{3}.
5n^{3}-9n+15-n^{2}
Add 6 and 9 to get 15.
8n^{3}-9n+6-3n^{3}-n^{2}+9
To find the opposite of 3n^{3}+n^{2}-9, find the opposite of each term.
5n^{3}-9n+6-n^{2}+9
Combine 8n^{3} and -3n^{3} to get 5n^{3}.
5n^{3}-9n+15-n^{2}
Add 6 and 9 to get 15.
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