|   | 1 |  initial version  | 
Use polynomials over the complex ring CC:
sage: R.<x> = CC[]
sage: p=x^2+2
sage: p.factor()
(x - 1.41421356237310*I) * (x + 1.41421356237310*I)
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                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.