# What Is A Variable Expression

The same rule applies to expressions with variables. Variables are used to change verbal expressions into algebraic.

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What is a variable expression. A variable expression is a combination of terms and mathematical operations that contains at least one variable. One may use a variable in the same manner as all other numerals. An expression is just a mathematical phrase.

The letters x y z a b c m and n are probably the most commonly used variables the letters e and i have special values in algebra and are usually not used as variables the letter o is usually not used because it can be mistaken for 0 zero. An algebraic expression is almost exactly the same except it also contains variables. In this tutorial you ll learn about two popular types of expressions.

Variable expression algebraic expression a variable expression or an algebraic expression is a combination of terms by the operations such as addition subtraction multiplication division etc. An expression can be simple or complex enough to hold multiple expressions. They are very handy to dynamically update properties at run time.

In this chapter we introduced the concept of using variables and using them in expressions. A variable is a letter used to stand for a number. A term is a single number variable or a number and a variable multiplied together.

To evaluate an algebraic expression you have to substitute each variable with a number and perform the operations included. Latex 4a 3 4 3 cdot a 3 latex latex xy 2 x 2y 2 latex each of the other rules for operating on numbers applies to expressions with variables as well. Expressions like variables may appear in action line arguments in testarchitect test modules and user defined actions.

Expressions are made up of both variables and operators which are used to tell the computers how to combine the values. We also showed how to print variables along with text. Example of a variable expression an example of a variable expression or an algebraic expression is 5x 7 5 x 7.

We will use this knowledge to create our own functions in the next chapter. Expressions are based on the expression language and expression evaluator. A variable as we learned in pre algebra is a letter that represents unspecified numbers.

A numerical expression contains numbers and operations. You will see how each of these applies in the following examples. This could contain symbols identifiers literals functions and operators.

An expression is any combination of literal values variables operators and functions that follows a set of rules and which needs to be evaluated before it can be used. Numerical and algebraic expressions. An expression is a code snippet which returns a value.

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