Learning Target

1. Learning Target TSW evaluate simple algebraic expressions.

2. Variable A symbol that represents an unknown quantity. Most of the time, a letter will be used. Example: n+2 In this case, “n” is the variable.

3. Algebra The branch of mathematics that involves expressions with variables.

4. Algebraic Expressions Contain numbers, variables, and at least one operation. Examples: 12 + c m - 8

5. Evaluating Algebraic Expressions Evaluate n+3 if n=4. The expression is n+3. To evaluate, you replace n with 4. n+3 becomes 4+3. n+3 when n=4 equals 7 when the expression is evaluated.

6. Algebraic Expressions Involving Multiplication In algebra, the multiplication symbol is often omitted. You will see things like the following examples: 6d means 6 times d 8st means 8 times s times t mn means m times n The numerical factor of a multiplication expression that contains a variable is called a coefficient. In the previous example, “6” is the coefficient in the expression “6d”.

7. Important Information In most algebraic expressions, the fraction bar is used as a grouping symbol. You should evaluate expressions in the numerator and denominator separately before dividing.

8. Defining a Variable When translating a verbal phrase (word problem) into an algebraic expression: Describe the situation using only the most important words. Choose a variable that represents the unknown quantity. Write an algebraic expression that represents the verbal description.