Welcome to x equals.
Please choose a video course from the above drop down menu options but please take some time to appreciate the value of x.
"In algebra, the letter 'x' is often used to represent an unknown quantity or variable. Similarly, in English, x represents the unknown, as in X-rays, which baffled their discoverer, and Malcolm X, who chose the symbol to represent the forgotten name of his African ancestors.
This meaning of the letter x traces back to the Arabic word for "thing," or šay'. In ancient texts, such as Al-Jabr, a manuscript written in Baghdad in 820 A.D. that established the rules of algebra, mathematical variables were called things. (An equation might read "three things equal 15," for example — the thing being five.)
When Al-Jabr was later translated into Old Spanish, the word šay' was written as "xei." This soon came to be abbreviated as x.
and x equals ....."
This meaning of the letter x traces back to the Arabic word for "thing," or šay'. In ancient texts, such as Al-Jabr, a manuscript written in Baghdad in 820 A.D. that established the rules of algebra, mathematical variables were called things. (An equation might read "three things equal 15," for example — the thing being five.)
When Al-Jabr was later translated into Old Spanish, the word šay' was written as "xei." This soon came to be abbreviated as x.
and x equals ....."