If a calculation contains at least one variable, it is called an algebraic expression. For example, is an algebraic expression because it contains the variable
Numbers written in front of the variables are called coefficients, specifying how many of the variable there are. The terms not containing any variables are called constants. Because can be any value, substituting values for into the algebraic expression can result in infinitely many values.
|Sample -value||Expression||Simplified expression|
Note that an expression that only contains constants is called a numeric or numerical expression.