x2
x
=0
-2x2+13x
-2x2+13x-20=0
-2x2+13x-18=0
-2x2+13x-15=0
-2x2+13x-11=0
-2x2+13x-6=0
-2x2+13x+7=0
-2x2+13x+15=0
-20
-18
-15
-11
-6
7
15