Question 1160522
<pre>
synthetic division to 'check' root of -3

-3   |    1    7    0     -36
     |
     |        -3   -12     36
     |_____________________________
          1    4   -12     0
</pre>
now factorize {{{x^2+4x-12}}}.



{{{p(x)=(x+3)(x-2)(x+6)}}}