Question 371888
Use polynomial long division,
<pre>

           -3x^2 - x - 9
          __________________________________
-3x^2+x+2 | 9x^4 +  0x^3 + 20x^2 - 11x - 18
        -  (9x^4 -  3x^3 -  6x^2)
          ----------------------------
                    3x^3 + 26x^2 - 11x
                 - (3x^3 -   x^2 -  2x)
                   --------------------
                           27x^2 -  9x - 18 
                       -  (27x^2 -  9x - 18)
                          ------------------
                                          0
</pre>
{{{(9x^4-18+20x^2-11x)/(-3x^2+x+2)=(-3x^2 - x - 9)}}}