Ch. 5 Lesson 1/2 Combine Like Terms + Evaluating Expressions

Combining like terms means to simplify an expression by adding or subtracting terms that have the same variable raised to the same power.

32

Substitute the value of the variable and then perform the exponentiation.

8

17

7

A variable is a symbol, often a letter, that represents a number that can change.

To evaluate an expression means to calculate its value by substituting the variables with their given values.

The order of operations is Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right), often abbreviated as PEMDAS.

6 (after simplifying $$\frac{6}{9}$$ to $$\frac{2}{3}$$ and adding 5)