In mathematics, value may refer to several, strongly related notions.
- The value of a variable or a constant is any number or other mathematical object assigned to it.
- The value of a mathematical expression is the result of the computation described by this expression when the variables and constants in it are assigned values.
- The value of a function, given the value(s) assigned to its argument(s), is the value assumed by the function for these argument values.
For example, if the function f is defined by f(x) = 2x2 – 3x + 1, then assigning the value 3 to its argument x yields the function value 10, since f(3) = 2·32 – 3·3 + 1 = 10.