(x + 1)^8 = 256
(x + 1)^8 = 2^8
(x + 1)^8 - 2^8 = 0
[(x + 1)^4]^2 - (2^4)^2 = 0
[(x + 1)^4 + 2^4] * [(x + 1)^4 - 2^4] = 0
[(x + 1)^4 + 2^4] > 0 при любом значении х
=>
[(x + 1)^4 - 2^4] = 0
[(x + 1)^2 + 2^2] * [(x + 1)^2 - 2^2] = 0
[(x + 1)^2 + 2^2] > 0 при любом значении х
=>
[(x + 1)^2 - 2^2] = 0
[(x + 1) + 2] * [(x + 1 - 2] = 0
(x + 3) * (x - 1) = 0
x1 = - 3
x2 = 1