Answer:
= 7k³ - k² - 3k + 16
Explanation:
subtract:
-2k³ + k² - 9 from 5k³ - 3k + 7
i.e.
5k³ - 3k + 7 - (-2k³ + k² - 9)
= 5k³ - 3k + 7 + 2k³ - k² + 9
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