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variable (mathematics)
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Variable (mathematics)
In mathematics, a changing quantity (one that can take various values), as opposed to a constant. For example, in the algebraic expression y = 4x3 + 2, the variables are x and y, whereas 4 and 2 are constants.
A variable may be dependent or independent. Thus if y is a function of x, written y = f(x), such that y = 4x3 + 2, the domain of the function includes all values of the independent variable x while the range (or co-domain) of the function is defined by the values of the dependent variable y.
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