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### Course: Algebra (all content) > Unit 1

Lesson 4: Evaluating expressions word problems- Evaluating expressions with variables word problems
- Evaluating expressions with variables: temperature
- Evaluating expressions with variables word problems
- Evaluating expressions with variables: cubes
- Evaluating expressions with variables: exponents
- Evaluating expressions review

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# Evaluating expressions review

An algebraic expression like 3x can be evaluated for any value of x. Say x=4, then 3x = 3*4 = 12. In this article, we review how to evaluate algebraic expressions.

## What does it mean to evaluate an algebraic expression?

An algebraic expression like $2x+3$ can be evaluated by substituting a value for $x$ . For example, if $x={4}$ then:

We can also evaluate more complicated expressions that have more than one variable. For example, we can evaluate $10+2p-3r$ when $p={4}$ and $r={5}$ :

*Want to learn more about evaluating expressions? Check out this video. And here's a word problem video if you're curious how this concept might apply to the real world.*

## Practice

*Want more practice like this? Check out this basic exercise and this more advanced exercise.*

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