x2
x
=0
-18x2+9x
-18x2+9x-1=0
-18x2+9x+2=0
-18x2+9x+5=0
-18x2+9x+9=0
-18x2+9x+14=0
-18x2+9x+20=0
-
2
5
9
14
20