In maths the symbols x and n are usually used to represent an unknown quantity.
These may be referred to as a variable.
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An algebraic expression uses a letter to represent an unknown quantity.
a letter or symbol that stands for one or more numbers is a
The definition of coefficient in mathematics is a number of symbol that is multiplied by a variable or an unknown quantity in algebra. Some examples of coefficients are A in Ax, and x in x(c+d).
a variable
Variable
x
"x" stands for any unknown or variable quantity; 3x means 3 times this quantity.
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x or any other variable
It is a variable and is expressed as a letter as for example it could be x or y
Nobody 'invented' it... letters are often used in maths to signify an unknown quantity.
In mathematics, a variable is a symbol that represents a quantity that can change or vary in a given problem or equation. Variables can be used to denote unknown values or to represent values that depend on other factors. They are commonly denoted by letters such as x, y, or z.
x= the unknown
X is the symbol for multiplication, as in 2X2=4 X (or any other letter) is often used to represent an unknown quantity.
The Unknown Quantity - 1919 was released on: USA: 14 April 1919
The symbol V stands for voltage.