x2
x
=0
-2x2+7x
-2x2+7x-6=0
-2x2+7x-5=0
-2x2+7x-3=0
-2x2+7x+4=0
-2x2+7x+9=0
-2x2+7x+15=0
-2x2+7x+22=0
-6
-5
-3
4
9
15
22