1) (x-1)(x-7)=0
x-1=0
x-7=0
x=0
x=7
X1 = 1; X2 = 7
2) (x+2)(x-9)=0
x+2=0
x-9=0
x=-2
x=9
X1 = -2; X2 = 9
3) (x-11)(x+6)=0
x-11=0
x+6=0
x=11
x=-6
X1 = -6; X2 = 11
1) (x-1)(x-7)=0
x-1=0
x-7=0
x=0
x=7
X1 = 1; X2 = 7
2) (x+2)(x-9)=0
x+2=0
x-9=0
x=-2
x=9
X1 = -2; X2 = 9
3) (x-11)(x+6)=0
x-11=0
x+6=0
x=11
x=-6
X1 = -6; X2 = 11
Удачи!