Why is X often used as a variable? On June 15, 2015, Terry Moore wrote in Cosmos Magazine that much of what is known about mathematics originated in Persia and Arabia. The word algebra literally comes from the Arabic word al-jabr which means “the reunion of broken parts.” When Spanish scholars were translating Arabic mathematical texts, they often came across the Arabic word shay-un which means “something.” Since Spanish doesn’t have the “sh” sound, they used the Greek letter chi (X) instead. La
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