536 BC -- The biblical Daniel receives an angelic visitor. see Daniel 10:4 (http://bible.gospelcom.net/cgi-bin/bible?passage=daniel+10%3A4&language=english&version=NLT)
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... the common denominator is 4a2. We get
<math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math>
Taking square roots of ...