(x^2+x-3)^2 + 12(x^2+x-3) + 27 = 0
t = x^2 + x - 3
t^2 + 12t + 27 = 0
t^2 + 12t + 36 = 9
(t + 6)^2 = 9
t = -6 +- 3
t=-9: x^2 + x - 3 = -9
x^2 + x + 6 = 0
Корней нет
t=-3: x^2 + x - 3 = -3
x^2 + x = 0
x (x + 1) = 0
x = 0 или x = -1
(x^2+x-3)^2 + 12(x^2+x-3) + 27 = 0
t = x^2 + x - 3
t^2 + 12t + 27 = 0
t^2 + 12t + 36 = 9
(t + 6)^2 = 9
t = -6 +- 3
t=-9: x^2 + x - 3 = -9
x^2 + x + 6 = 0
Корней нет
t=-3: x^2 + x - 3 = -3
x^2 + x = 0
x (x + 1) = 0
x = 0 или x = -1