You can 
put this solution on YOUR website! Very routine arithmetic
x+1 divisor would be for root being -1.
dividend   
; because we need to account for all the missing degrees of x.
-1  |    4    0    -3   0   1   0   5
    |        -4     4   -1  1   -2  2
    |______________________________________
        4    -4     1   -1  2   -2   7
You interpret that!