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01 Dec 2017
Why is letter “X” is the default choice when you need to represent an unknown variable in Algebra, out of the 26 letters in the alphabet? To find out, let’s delve into the origins of Algebra.
Algebra was invented by Arabian mathematicians in the 800s. The word “Algebra” comes from the Arabic word “al-jabr”, which means “restoration.” In the 9th century, a Persian mathematician named Muhammad ibn Musa al-Khwarizmi translated many ancient Indian and Greek mathematical works, including the seminal “Addition and Subtraction after the Method of the Indians”, and compiled them into the mathematical bible of its time. Thanks to this feat, he became known as the Father of Algebra.
Back then, mathematicians used the Arabic word “šhay”, which means “thing”, to represent the unknown that they wanted to find, much like the way modern mathematicians use “X”.
In the 11th century, when the concept of Algebra reached Spain, Spaniards found the word “šhay” difficult to pronounce. Thus, Spanish scholars replaced the “sh” sound with the Greek “ch” sound, which is represented by the Greek “chi”. Written as χ, eventually, this morphed into the modern “X”
That’s how “X” became the default representation of an unknown variable in Algebra!
Fun facts about the letter “X”:
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