Question 1117208
The two zeros or roots are  -1, and +2.


{{{system(-p+3+9+q=0,8p+12-18+q=0)}}}


{{{system(-p+q=-12,8p+q=18-12)}}}


{{{system(p-q=12,8p+q=6)}}}, simplified linear system

-

{{{9p=18}}}

{{{highlight(p=2)}}}


{{{q=p-12}}}

{{{q=2-12}}}

{{{highlight(q=-10)}}}