Question 1102277
<pre>
Possible rational roots to try:  -4, -2, -1, 1, 2, 4

-1   |    1   0    -3   0    -4
     |        -1    1   2    -2
     ---------------------------------
         1   -1    -2   2     -6


-2   |    1   0    -3   0    -4
     |       -2     4   -2    4
     ---------------------------------
         1   -2    1    -2   0        -2 is a root, (x+2)

2     |    1   -2    1    -2
      |         2    0     2
      ----------------------------
           1    0    1     0          2 is a root, (x-2)


</pre>

Other roots are found using {{{x^2+1=0}}}, from the result of the last synthetic division shown.


Note the use of 'i' in  i^2=-1, imaginary number i.
{{{i=-sqrt(-1)}}} or {{{i=sqrt(-1)}}}


{{{x^2+1=0}}}
{{{x^2=-1}}}
{{{system(x=-sqrt(-1),or,x=sqrt(1))}}}
{{{system(x=-i,or,x=i)}}}




--------------------------------
ALL THE ROOTS:
{{{system(-2,2,-i,i)}}}
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