I'm sorry, but I'm a bit confused on what you're trying to ask. Could you please clarify?
Answer 29
5+6=11
11•4=44
44-15=29
For this case what you can do is factorize the <span>polynomial equation</span>, which would be left like follows
x ^ 3 + x ^ 2 + 9x + 9 = 0
(x + 1) (x ^ 2 + 9) = 0
Resolving, we have that the missing root is
x = -1
Answer
x=-1
How do you expect us to answer your question if we dont know if it is an equation but 7.0