-1x^2 + 8x - 15 = 0
-1(x^2-8x+15)=0
-1(x )(x ) ( -5)( -3)=0
-1(x-5) (x-3) = 0
Solve:
-1(x-5) =0
-1(x) (-1)(-5) =0
-1x+5=0
-1x+5-5=0-5
-1x=-5
-1x/-1=-5/-1
x=5
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