Question

help me 2 and 3 пожалуйста

Answer 1

2) (x-7)^2-11=(x-2)(x+2)
x^2-14x+49-11
-14x+49-11= -4
-14x+38= -4
-14x-4-38
-14x= -42
x=3

Answer 2

-216+8x=6x

Answer 3

8x-6x=216

Answer 4

2x=216

Answer 5

x=108

Answer 6

спасибо