Lecture notes for Section 1.2

1. Section 1.2 ­ Algebraic Expressions and Models A.notebook July 29, 2009
Section 1.2 ­ Algebraic Expressions and Models
Vocab Numerical Expression: consists of
Terms numbers, operations, and grouping
symbols.
Example: 5 + 7; 2(4 ­ 2)
Algebraic Expression: like above,
with variables
Example: 2x + 3; 5y(3y ­ 7)
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2. Section 1.2 ­ Algebraic Expressions and Models A.notebook July 29, 2009
Order of 1. Operations inside grouping
Operations symbols
2. Evaluate powers
3. Multiply & divide left to right
4. Add & subtract left to right
Using
Order of ­4 + 2(­2 + 5)2
Operations
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3. Section 1.2 ­ Algebraic Expressions and Models A.notebook July 29, 2009
Evaluating
Evaluate ­3x2 ­ 5x + 7 when x = ­2
Algebraic
Expressions
Simplifying
Simplify 2(x + 1) ­ 3(x ­ 4)
Algebraic
Expressions
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4. Section 1.2 ­ Algebraic Expressions and Models A.notebook July 29, 2009
Homework Section 1.2 Worksheet
#2 ­ 42 even
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