Question 1057718
x = 4x^3 - 4x 
Rearrange this to
4x^3 - 4x - x = 0
4x^3 - 5x = 0
factor out x
x(4x^2 - 5) = 0
x = 0
and
4x^2 = 5
x^2 = 5/4
x = +/-{{{sqrt(5/4)}}}
x = +/- 1.118