Comment #11 on issue 604 by asmeurer: write tests for p = x**3+2*x**2+8; r
= roots(p, x);
http://code.google.com/p/sympy/issues/detail?id=604
roots() returns a dictionary (notice type(r)) of root:multiplicity terms.
For example:
In [5]: p = (x - 12)*(x - 13)**2*(x - 42)**2
In [6]: roots(p, x)
Out[6]: {12: 1, 13: 2, 42: 2}
You can use r.keys() to get a list of the keys, so you would want to do:
In [11]: r.keys()[0].evalf()
Out[11]: 0.465571231876768 + 1.5851039850309⋅ⅈ
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