Input
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The value that results from the substitution of a given input into an expression or function is the output. The value substituted into an expression or function is an input.
It is called the argument of the function.
Calculating the value of the expression when you have substituted numerical values for the variables.
When a given set of values for the variables are substituted in the expression the result is the value of the expression.
X2 Is an algebraic expression. X2 = 4 Is an equation that can be solved for X. The variable, X, in this case, has two values. In the expression any value can be substituted for X.