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The expression 103 is called a power. 10 is called the base and 3 is called the exponent. 103 means 10 • 10 • 10 103 = 1000 Two to the first power 22 Two to the second power or two squared 23 Two to the third power or two cubed 2n7 Two times n to the seventh power 1. 2. 3. 4. 4 – x3 4 – 3x 3x – 4 x3 – 4 Answer Now Examples: 1) 34 2) (0.2)5 3) (⅔)3 Is your answer 33 or 19? You can get 2 different answers depending on which operation you did first. We want everyone to get the same answer so we must follow the order of operations. ORDER OF OPERATIONS 1. Parentheses - ( ) or [ ] 2. Exponents or Powers 3. Multiply and Divide (from left to right) 4. Add and Subtract (from left to right) Evaluating an Algebraic Expression To evaluate a algebraic expression: 1. substitute the given numbers for each variable. 2. use order of operations to solve. Example # 1 n + (13 - n) 5 for n = 8 Example # 2 8y - 3x2 + 2n for x = 5, y = 2, n =3 2n m t 1. 2. 3. 4. 10 -10 -6 6 Answer Now