Answer:
11a³-4a²-14a-7
(The light blue/green one)
Explanation:
We'll need to combine like terms (terms with the same variables and exponents)
(4a³-8a-4a²)+(7a³-7-6a)
add/subtract
we'll keep -4a² and -7 as is as there aren't any other terms like them
11a³-14a-4a²-7
put into standard form:
11a²-4a²-14a-7
(The light blue/Green one)
Hope this helps!