x2
x
=0
-10x2+23x
-10x2+23x-13=0
-10x2+23x-12=0
-10x2+23x-9=0
-10x2+23x-6=0
-10x2+23x+5=0
-10x2+23x+14=0
-10x2+23x+21=0
-13
-12
-9
-6
5
14
21