Bellwork: Identify the property shown.
1. 5 ( 3 - 7 ) = 5 ∙ 3 - 5 ∙ 7
2. ( 8 + 6 ) + 4 = 8 + ( 6 + 4 )
Review: Perform the operation and give answer with appropriate
unit of measure.
Convert 88 ft/sec to miles/hr
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Page 11- Section 1.2 Algebraic Expressions and Models
Objectives:
1. IWBAT evaluate algebraic expressions.
2. IWBAT simplify algebraic expressions by combining like
terms.
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Page 11- Section 1.2 Algebraic Expressions and Models
Algebraic Expressions: consists of numbers, operations,
grouping symbols and variables
Variable: letter used to represent 1 or more values
Evaluate: replace variable(s) with values and simplify using
order of operations
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Why do we need Order of Operations?
15 - 3∙2
1st way:
2nd way:
We need rules so that everyone
gets the same answer!
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Ex: Evaluate.
1. -26 + 5 ( 1 - (-3) )3
2. -4x2 + 6x - 5 when x = -3
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Simplifying algebraic expressions
like terms: terms which have the same variable part
example: 3x2 and -5x2 are like terms
but 3x2 and -5x are not
Ex: Simplify.
1. 3 ( x - 2 ) - 5 ( x - 8 )
2. 7 ( x2 - 3 ) + 2 ( x2 - x + 1 )
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You have $50 and are buying some movies on DVD that cost $15
each. Write an expression that shows how much money you have
left after buying n movies. Evaluate the expression when n = 2 and
n = 3.
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Homework Assignment Lesson 1.2
Page 14-15, #s 16-52 even
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