-1x^2 + 10x - 9 = 0
-1(x^2-10x+9)=0
-1(x )(x ) ( -9)( -1)=0
-1(x-9) (x-1) = 0
Solve:
-1(x-9)=0
-1(x) (-1)(-9)=0
-1x+9=0
-1x+9-9=0-9
-1x=-9
-1x/-1=-9/-1
x=9
Solve:
-1(x-1) = 0
-1(x) (-1)(-1) = 0
-1x+1=0
-1x+1-1=0-1
-1x=-1
-1x/-1=-1/-1
x=1