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Electrum is a native alloy of gold and silver in which the latter metal may be present in quantities of up to 40%. Electrum from the Ural mountains carries 20% copper. The color of electrum is pale yellow or yellowish-white and the name is derived from the Greek word mentioned in the Odyssey meaning a metallic substance consisting of gold alloyed with silver. The same word was also used for the substance amber, probably because of the pale yellow color of certain varieties.

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Quadratic formula

... b and c, which are assumed to be real (but see below for generalizations) with a being non-zero. These solutions are also called the roots of the equation. The formul ...

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