Question 1098886
<pre>
-7   |    1     5     -20     -42
     |
     |         -7      14      42
     |_________________________________
         1     -2      -6       0
</pre>
You can use general solution of quadratic equation to find the roots of the quadratic factor:


{{{(x+7)(x^2-2x-6)=0}}}


-


{{{(2+- sqrt(4+4*6))/2}}}


{{{(2+- 2*sqrt(7))/2}}}


{{{highlight(1+- sqrt(7))}}}--------the two quadratic roots