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.
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.
An algebraic expression uses a letter to represent an unknown quantity.