1.2 notes - 2 2 d 2 4(d – 2c The expression-0.3y 6 1...

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1.2 Notes: Algebraic Expressions Warm – up: Compare the following expressions 1) |-4| ___ | 4 | 2) 69 . 0 ___ 3 2 Objective: - Evaluate algebraic expressions A variable is a symbol, usually a letter, that represents one or more numbers. An expression that contains a variable is an algebraic expression. When you substitute numbers for the variables in an expression and follow the order of operations, you evaluate the expression. Evaluate each expression: For x = 4 and y = -2 1) x y x ÷ + 2) 3x – 4y + x – y Evaluate an algebraic expression w/exponents. Evaluate ) 1 ( 2 2 + - - x x for x = 3. More examples: Evaluate the expressions for c = -3 and d = 5 1) c(3 – d) - c
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Unformatted text preview: 2 2) - d 2- 4(d – 2c) The expression -0.3y + 6 1 models the percent of eligible voters who voted in presidential elections from 1960 – 2000. In the expression, y represents the number of years since 1960. Find the approximate percent of eligible voters who voted in 1988. Using the model, what percent will vote in 2012? Simplifying Algebraic Expressions y x 3 7 2 + Like terms: have the same variable raised to the same power. Combining Like Terms: 1) 3k – k = 2) z z z z z +-+--) 10 ( 8 10 5 2 2 = You try: 1) -2(r + s) – (2r + 2s) = 2) 2 2 2 4 5 2 x x x x x-+-+ =...
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This note was uploaded on 05/13/2011 for the course MTH 98 taught by Professor Johnson during the Fall '09 term at Grand Valley State.

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1.2 notes - 2 2 d 2 4(d – 2c The expression-0.3y 6 1...

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