The Zaza are an ethnic minority[?] in eastern Turkey. Their language (Zazaki) is closely related to the Kurdish language. For this reason the Zaza are often referred to as a subgroup of the Kurds, which is not correct and heavily opposed by themselves.
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... the quadratic formula is not ideal. See Loss of significance for details.
Derivation
The quadratic formula is derived by the method of completing the square[?]. ...