Question 1128920
<pre>
-2  |   2   -1   -8   4
    |
    |      -4    10   -4
    |_________________________
       2   -5    2    0


2   |   2   -5   2
    |
    |        4  -2
    |__________________
       2    -1   0


{{{2x-1=0}}}
{{{2x=1}}}
{{{x=1/2}}}
</pre>
The zeros of F are  {{{system(-2,1/2,2)}}}