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Evaluating an expression consists of determining the value of an expression when the variable or variables of the expression take a specific value. This is done by substituting the given value for the variable in question into the expression and then simplifying it. As an example, consider the following expression. (x-1)^2/2 This expression is going to be evaluated considering that x is equal to 5. There are two steps to follow.
After the substitution, the variable disappeared and the algebraic expression turned into a numeric expression.
Consequently, when x is equal to 5, the given expression equals 8.
If an expression has more than one variable, each variable is replaced by its given value before all the required operations are performed.