Читать книгу SAT Math For Dummies with Online Practice - Mark Zegarelli - Страница 62

An expression is any string of mathematical symbols that you can place on one side of an equation, identity, or inequality. For example, consider this equation from the last section:

This equation includes two expressions: and .

As a mathematical concept, expressions often get lost in the shuffle when students are struggling to learn algebra. If you can, try not to let that happen as you revisit algebra while studying for the SAT. Think of it like this:

 An expression doesn't have an equals sign (=). Expressions are evaluated, simplified, or factored, but not solved.

 An equation is two expressions joined with an equals sign. Equations are to be solved.

In Chapter 3, you work extensively with expressions. In this section, I discuss a few more math words that help you to break down and understand expressions better.