x2
x
=0
-8x2+22x
-8x2+22x-15=0
-8x2+22x-14=0
-8x2+22x-12=0
-8x2+22x-9=0
-8x2+22x-5=0
-8x2+22x+6=0
-8x2+22x+13=0
-8x2+22x+21=0
-15
-14
-12
-9
-5
6
13
21