Answer:
2u³ + 7u² + u + 4
Step-by-step explanation:
(5u³+8u²+8u+6)-(3u³+u²+7u+2)
Opening the parenthesis,
Due to the negative sign in front of the second parenthesis the signs inside out still all change.
5u³ + 8u² + 8u + 6 - 3u³ - u² - 7u - 2
Collecting like terms
5u³ - 3u³ + 8u² - u² + 8u - 7u + 6 - 2
2u³ + 7u² + u + 4
