Question 71309
You wrote 5x^2-x^4+3x+x^4 by x+1
Now,    
   5x^2-x^4+3x+x^4 
=  5x^2+3x
when 5x^2 + 3x is divided by x + 1  then answer is 5x - 2 + 2/(x+1) .