Question 1157080
{{{k=-4}}}



Doing through synthetic division:

x+2 as possible factor, root to check  -2

<pre>
-2   |    1    -k       4
     |
     |         -2      2k+4
     |______________________________
          1   -k-2    2k+8
</pre>
{{{2k+8=0}, requirement if -2 is a root.
{{{2k=-8}}}
k=-4