x^2 + x >= 0
(x^2 + x)^2 + x^2 + x - 2 = 0
x^2 + x + (x^2 + x)^2 - 2 = 0
x1 = 1/2 + √5/2
x2 = - 1/2 - √7i/2
x^2 + x < 0
-1 < x ^ x < 0
-x^2 - x + (x^2 + x)^2 - 2 = 0
x5 = -2
x6 = 1
x7 = -1/2 - √3i/2
x8 = -1/2 + √3i/2
x1 = - 1/2 + √5/2
x2 = - √5/2 + 1/2
x1 = -1.61803398875
x2 = 0.61803398875