Question

Please show all work if applicable.

Answer 1

Have you been taught synthetic division. I don't think there is an easier way to do this.

- 1 || 1     3     5    3  
               -1   -2   -3 
      ==============    
        1     2     3   0

So the answer becomes 
Length = x^2 + 2x +3 which isn't very nice to factor, but it is the length. Long division will give you exactly the same answer. And this cannot be reduced further and still give answers in the real realm of numbers.