-1x^2 + 3x + 18 = 0
-1(x^2-3x-18)=0
-1(x )(x ) ( -6)( +3)=0
-(x-6) (x+3) = 0
Solve:
-1(x-6)=0
-1(x) (-1)(-6)=0
-1x+6=0
-1x+6-6=0-6
-1x=-6
-1x/-1=-6/-1
x=6
Solve:
-1(x+3) = 0
-1(x) (-1)(+3) = 0
-1x-3=0
-1x-3+3=0+3
-1x=3
-1x/-1=3/-1
x=-3