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Do Now 9/21/10 Take out HW from last night. Take out HW from last night.  Text p , #1-11 all, #18-41 all Copy HW in your planner. Copy HW in your planner.  Text p. 25, #42-50 all, #54-64 all, but not 60  Quiz Sections Wednesday In your journal, explain why the absolute value of a number is always positive. Can you create a problem that contains an absolute value symbol where the answer would be negative? In your journal, explain why the absolute value of a number is always positive. Can you create a problem that contains an absolute value symbol where the answer would be negative?

Homework Text p , #1-11 all, #18-41 all 1) ) distance is always positive 3) -9, -5, -3, 0, 6, 12 4) 1 5) 9 6) 15 7) 12 8) -14 9) 33 10) 24 11) ) -12, -6, -1, 0, 4 23) -8, -5, -4, 7, 15 24) -10, -5, 35, 40, 60 25) -30, -25, -22, ) 22 27) 7 28) 21 29) 40 30) 38 31) 42 32) 73 33) ) -6 35) -9 36) 2 37) 11 38) 31 39) 67 40) ) -100

Objective SWBAT evaluate expressions involving absolute value brackets and negatives.

the set of whole numbers and their opposites Section 1.4, “Compare and Order Integers” Integer-

Integers are divided into three categories:  Positive numbers  Negative numbers  ZeroIntegers negative positivezero

ABSOLUTE VALUE ABSOLUTE VALUE  The distance a number is away from ZERO. Distance is always “positive.” negative positivezero What is the absolute value of -4? or |-4| |-4| = 4 What is |4| ? |4| = 4

Evaluate the Expressions when x = -5 -(-5) 5 -x Substitute The opposite of -5 is – |-5| 12 17– |x| Substitute The absolute value of -5 is – 5

Evaluate the Expressions when x = -4 and y = -7 (-x) + (-y) |y| – |-x| -(-4) + -(-7) |-7| – |-(-4)| 7 – 4 3

Evaluate the Expressions when x = -4 and y = -7 -|x| -|-4| -4 The absolute value of -4 is 4. The opposite of 4 is -4. -|-y| -|-(-7)| -7 The absolute value of -(-7) is 7. The opposite of 7 is -7.

Review Sections 1.3 & 1.4

Section 1.3, Order of Operations Section 1.3, Order of Operations Order of Operations Order of Operations – the rules established to evaluate an expression involving more than one operation 4(y² – 8) 13 * ÷ x · 6

1 3 4 PEMDAS 2 Order of Operations Evaluate expressions within grouping signs. ( ) parentheses, [ ] brackets, fraction bars Evaluate powers. Multiply and divide from left to right. Add and subtract from left to right.

the set of whole numbers and their opposites Section 1.4, “Compare and Order Integers” Integer-

Integers are divided into three categories:  Positive numbers  Negative numbers  ZeroIntegers negative positivezero

ABSOLUTE VALUE ABSOLUTE VALUE  The distance a number is away from ZERO. Distance is always “positive.” negative positivezero

Homework BLUFF!  Text p. 25, #42-50 all, #54-64 all, but not 60  Quiz Sections Wednesday