Do Now 10/1/09 Take out HW from last night. Take out HW from last night. Text p.66, #16-26 even, 28-31 all, 32- 46 evens Text p.66, #16-26 even, 28-31.

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Do Now 10/1/09 Take out HW from last night. Take out HW from last night. Text p.66, #16-26 even, all, evens Text p.66, #16-26 even, all, evens Copy HW in your planner. Copy HW in your planner. Text p.81, #10-21 all, #33-35 all Text p.81, #10-21 all, #33-35 all In your journal, define the word “collect”. Do you “collect” anything? If so what? In your journal, define the word “collect”. Do you “collect” anything? If so what?

Homework Text p.66, #16-26 even, all, evens 16) 56 16) 56 18) 7 18) 7 20) ) ) 4 22) 4 24) x ) x ) -48c 26) -48c 28) identity property of addition 28) identity property of addition 29)commutative property of multiplication 29)commutative property of multiplication 30) associative property of addition 30) associative property of addition 31) identity property of multiplication 31) identity property of multiplication 32) 21,120 ft 32) 21,120 ft 34) 6 minutes 34) 6 minutes 36) 308 Calories 36) 308 Calories 38) 220,000 lb 38) 220,000 lb 40) No. You must always put on your socks before your shoes 40) No. You must always put on your socks before your shoes 42) ) ) ) ) 27 46) 27

Objective SWBAT simplify variable expressions SWBAT simplify variable expressions

Parts of an Expression -3x + 2x + 8 Terms of the expression are separated by addition signs Coefficient the number part of a variable term Constant term that has no variable Section 2.3 “Simplifying Variable Expressions”

Simplifying an Expression -3x + 2x x + 2x + 8 Like Terms terms that have The same variable COLLECTING LIKE You can simplify an expression by COLLECTING LIKETERMS -3x + 2x x + 2x x x + 8

Simplifying an Expression Write expression as a sum “Opp-Opp” COLLECT LIKE TERMS 4n – 7 – n + 9 4n – 7 – n + 9 3n + 2 3n + 2 4n + (-7) + (-1n) + 9 4n + (-7) + (-1n) + 9 4n + (-1n) + (-7) + 9 4n + (-1n) + (-7) + 9 Commutative Property 4n – 7 – 1n + 9 4n – 7 – 1n + 9 The coefficient is always 1 for a variable with no number in front of it.

Parts of an Expression 7x² + 5x x 1) List the terms of the expression. 2) List the coefficients of the expression. 3) List the like terms of the expression. 4) List the constant terms of the expression. 5) Simplify the expression. 7x², 5x, 8, 3x 7, 5, 3. 5x and 3x 8 7x² + 8x + 8

Simplify the Expression A. 3a + 2b + 7a B. 5b² b² C. 2x – – 3x D. x + y – 12y – 3x A). 10a + 2b B). 15b² + 7 C). -x + 9 or -1x x + 9 D). -2x + (-11y) or -2x – 11y -2x – 11y

Simplifying Expressions in Geometry What is the perimeter of the trapezoid? What is the perimeter of the trapezoid? 3x 5x x + 2 Perimeter is the distance around a figure. x x + x x (reorder terms) (reorder terms) Add together each of the sides. x + 3x + x + 5x (combine like terms) 10x + 4

Find the Perimeter of the Figure 4 + 2w w Perimeter = 2(L) + 2(W) Perimeter = 2(w) + 2(4 +2w) Perimeter = 2w w) = 6w + 8 = 6w + 8 Area = length x width Area = (w)(4 + 2w) Area = 4w + 2w² Challenge What is the area of the figure?

Homework - Text p.81, #10-21 all, #33-35 all 24