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Variable
In a function, a variable can have different values.
Example 1
In a simple form you get
f (x) = a · xn
where x is the variable, a the coefficient and n the exponent.
Example 2
In the polynomial
with the variable x are a0, a1, a2, ... , an the coefficients of the subsequent terms.
Example 3
In the quadratic function of the variable x
is p a parameter that can have different values.