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