Answer:
9. 12u² + 15u - 5ut - 9 is your answer
10. 7a³ - 12ab² - 5 is your answer
Step-by-step explanation:
Combine like terms (terms with the same amount of variables):
9. 4u² + 8u² + 15u - 5ut - 9
(4u² + 8u²) + 15u - 5ut - 9
12u² + 15u - 5ut - 9
12u² + 15u - 5ut - 9 is your answer
10. 3a³ - 11ab² + 4a³ - ab² - 5
(3a³ + 4a³) (- 11ab² - ab²) - 5
7a³ - 12ab² - 5
7a³ - 12ab² - 5 is your answer
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