How do you divide #(x^2-2x-4) / (x-4) #?
Have a look at:
Not exactly the same numbers but the method works: Look at contents of Explanation
The first thing to try is see if there are any factors that can be cancelled out. If not then it is back to the traditional ways of doing long division.
Factors of 4 are 1x4; 2x2. The sum of both these do not match the -2 in