Comment #4 on issue 2813 by smi...@gmail.com: solve(x**2 - x - 0.1) doesn't
give both solutions
http://code.google.com/p/sympy/issues/detail?id=2813
The only way to get this single solution now is to explicitly say that
you don't want solve to work in Rationals:
```python
@XFAIL
def test_issue_2813x():
#polys's roots gives only one answer
assert len(solve(x**2 - x - 0.1, rational=False)) == 2
def test_issue_2813():
assert solve(x**2 - x - 0.1, rational=True) == \
[S(1)/2 + sqrt(35)/10, -sqrt(35)/10 + S(1)/2]
assert all(s.is_Number for s in solve(x**2 - x - 0.1)) #
[-0.0916079783099616, 1.09160797830996]
```
(This is from https://github.com/sympy/sympy/pull/656 .)
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