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Do Now 10/1/09

Do Now 10/1/09. Take out HW from last night. Text p.66, #16-26 even, 28-31 all, 32- 46 evens Copy HW in your planner. Text p.81, #10-21 all, #33-35 all In your journal, define the word “collect”. Do you “collect” anything? If so what?. 16) 56 18) 7 20) -180 22) 4 24) x + 29 26) -48c

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Do Now 10/1/09

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  1. Do Now 10/1/09 • Take out HW from last night. • Text p.66, #16-26 even, 28-31 all, 32- 46 evens • Copy HW in your planner. • Text p.81, #10-21 all, #33-35 all • In your journal, define the word “collect”. Do you “collect” anything? If so what?

  2. 16) 56 18) 7 20) -180 22) 4 24) x + 29 26) -48c 28) identity property of addition 29)commutative property of multiplication 30) associative property of addition 31) identity property of multiplication 32) 21,120 ft 34) 6 minutes 36) 308 Calories 38) 220,000 lb 40) No. You must always put on your socks before your shoes 42) 110 44) 300 46) 27 HomeworkText p.66, #16-26 even, 28-31 all, 32- 46 evens

  3. Objective • SWBAT simplify variable expressions

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

  5. Simplifying an Expression Like Terms terms that have The same variable -3x + 2x + 8 -3x + 2x + 8 You can simplify an expression by COLLECTING LIKE TERMS -1x + 8

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

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

  8. 3a + 2b + 7a 5b² + 7 + 10b² 2x – 7 + 16 – 3x D. x + y – 12y – 3x A). 10a + 2b Simplify the Expression B). 15b² + 7 C). -x + 9 or -1x + 9 D). -2x + (-11y) or -2x – 11y

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

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

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

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