Помогите с алгеброй

1.

a²-2a-11a+22
a(a-2)-11(a-2)
(a-2)(a-11)

4.

-a²+2a-13a+26
-a(a-2)-13(a-2)
(a-2)(-a-13)
(2-a)(a+13)

2.

a²-10a-7a+70
a(a-10)-7(a-10)
(a-10)(a-7)

5.

-a²+3a-22a+66
-a(a-3)-22(a-3)
(a-3)(-a-22)
(3-a)(a+22)

3.

a²-2a-17a+34
a(a-2)-17(a-2)
(a-2)(a-17)

6.

-a²+3a-24a+72
-a(a-3)-24(a-3)
(a-3)(-a-24)
(3-a)(a+24)