The Penguins were an American Doo-Wop group of the 1950s and 60s, best remembered for the hit "Earth Angel". One of a number of Doo-Wop groups of the period named after birds (such as The Orioles, The Flamingos, The Crows[?] and others.)
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... computing roots numerically, the usual form of the quadratic formula is not ideal. See Loss of significance for details.
Derivation
The quadratic formula is derived by ...