One way is to use polynomials
sage: x = polygen(QQ)
sage: (x^4 - 2*x - 1).roots(RealField(32), multiplicities=False)
[-0.474626618, 1.39533699]
sage: (x^4 - 2*x - 1).roots(ComplexField(128), multiplicities=False)
[-0.47462661756260555032941320989493141267,
1.3953369944670730187931436130710553428
I still don't know my way around the Sage documentation... Sorry for the
elementary question.
I just tried to use the *solve* command to find the roots of a
polynomial of degree 4 with real coefficients. The result is a list of
solutions expressed in (complicated) symbolic form. When I attempt
