In the last two lessons, you've evaluated numerical expressions by using the order of operations. We are going to use these same rules to evaluate algebraic expressions.
An Algebraic expression is an expression that you will see most often once you start Algebra. In Algebra we work a lot with variables and numerals. A variable is a symbol, usually a letter, that represents one or more numbers.
Thus, an algebraic expression consists of numbers, variables, and operations.
An algebraic expression consists of numbers, variables, and operations. Here are a few examples:
In order to evaluate an algebraic expression, you must know the exact values for each variable. Then you will simply substitute and evaluate using the order of operations. Take a look at example 1.
Now, lets evaluate algebraic expressions with more than one variable. Don't forget to always use the order of operations when evaluating the expression after substituting.
And... one last example where we will look at the fraction bar as a grouping symbol and evaluating the expression when you have more than one of the same variable.
If you are familiar with the order of operations, then evaluating algebraic expressions is quite easy! Just remember to substitute the given values for each variable and evaluate.
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