x2
x
=0
-2x2+11x
-2x2+11x-15=0
-2x2+11x-14=0
-2x2+11x-12=0
-2x2+11x-9=0
-2x2+11x-5=0
-2x2+11x+6=0
-2x2+11x+13=0
-2x2+11x+21=0
-15
-14
-12
-9
-5
6
13
21