x2
x
=0
-6x2-13x
-6x2-13x-7=0
-6x2-13x-6=0
-6x2-13x-5=0
-6x2-13x-2=0
-6x2-13x+5=0
-6x2-13x+8=0
-6x2-13x+15=0
-6x2-13x+19=0
-7
-6
-5
-2
5
8
15
19