#### WebQuest

# Math Refresher

#### Evaluation

EXPRESSIONSA combination of variables and numbers using the operations of addition, subtraction, and multiplication/division

__without an equal sign__is known as an

**expression**.

To

*an expression means to substitute a number in place of a variable and then to simplify as much as possible. To*

__evaluate__*an expression means to combine*

__simplify__*like terms*within the expression and simplify as much as possible.

You must follow the

*order of operations*to evaluate and simplify.

VOCABULARY OF EXPRESSIONS

VOCABULARY OF EXPRESSIONS

**SAMPLE ALGEBRAIC EXPRESSION: 3x + 12**

** Terms**: The elements or parts of an algebraic expression that are separated by a plus (+) sign or a minus(-) sign. In the above example 3x and 12 are both terms

__Constant Term__: A term that only has one number and no variables. 12 is the constant in our example.

__Coefficient__: The number that appears before the variable. In the above example 3 and 12 are the coefficients. Yes, the constant is also considered a coefficient.

__Factors of the Term__: In an individual term the factors are each part of that term. In the example, 3 and x are the factors of the first term.

__Like Terms__: Terms that have exactly the same variable factor. There are no like terms in the above example. Consider 7x + 4x+19. The 7x and 4x would be considered like terms.

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