Full text of RFC 1812 (http://www.ietf.org/rfc/rfc1812.txt) Requirements for IP Version 4 Routers. F. Baker. June 1995. (Format: TXT=415740 bytes) (Obsoletes RFC 1716[?], RFC 1009) (Updated by RFC 2644) (Status: PROPOSED STANDARD)
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<math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math>
Generalizations
The formula and its proof remain correct ...