In [22]: f = Poly(x**4 + 3.0*sqrt(2.0)*x**3 - (78.0 +
24.0*sqrt(3.0))*x**2 + 144.0*(2*sqrt(3.0) + 9.0))

In [23]: nroots(f)
Out[23]: [-12.7530479110482, -3.85012393732929, 4.89897948556636,
7.46155167569183]

In [25]: RootOf(f,0).evalf()
# It hangs

reported as http://code.google.com/p/sympy/issues/detail?id=3294

However I hope that I will be able to get comments about this here on
the mailing list.

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