Answer: 
The quotient in polynomial form is 2x+6
Explanation:
use the synthetic division 
 ---------------------------
-1 2 8 6
 0 -2 -6 
 -------------------------------------
 2 6 0
Now we use the quotient we got.
quotient is 2 and 6. Remainder is 0
In quotient we have only two numbers
So we write it as 2x+6
The quotient in polynomial form is 2x+6