Terry moore

           Terry moore tells about the question of why the letter X represents the unknown. Such as "the X prize" "the X files" "project X" "TEDx". In 2006 he decided to study Arabic. According to him Arabic is a very logical language. According to terry moore writing Arabic like assembling an equation, because each part is very precise and carries a lot of information. He first explains the origin of the word algebra, which comes from the word al-jebr, and al-jebr is roughly translated into "a system for matching different parts". Al-jerb finally came to England as algebra. In the 11th and 12th centuries, Arabic manuscripts containing mathematical policies to Europe were Spanish. By the time the text arrived, there was an extraordinary interest to translate the Arabic into the European language. but there is one problem that emerged at that time, that there is some noise in the Arabic language which is difficult to be pronounced by the Europeans without much practice. For example the letters "Shin", like the word shalan meaning "something". Which became the problem of medieval spanish scholars in charge of translating the language is the word sheen and shalan that can not be changed into Spanish. Because spanish does not have the SH. But they make sosuli lend CK sounds from classical greek in the form of Chi letters. After changing it, this material forms the basis of mathematical textbooks for nearly 600 years. Now we have an answer to the question why X becomes the unknown. The answer is, X becomes the unknown because we can not say "sh" in spanish.