1 / 14

Do Now 10/2/09

Do Now 10/2/09. Take out HW from last night. Text p.81, #10-21 all, #33-35 all Copy HW in your planner. Text p.74, #12-48 evens Quiz sections 2.1-2.3 Thursday In your journal, find the perimeter of the figure. (Hint: The answer will be a variable expression). 3x. x + 2. x + 2. 5x.

lionel-schwartz
Download Presentation

Do Now 10/2/09

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Do Now 10/2/09 • Take out HW from last night. • Text p.81, #10-21 all, #33-35 all • Copy HW in your planner. • Text p.74, #12-48 evens • Quiz sections 2.1-2.3 Thursday • In your journal, find the perimeter of the figure. (Hint: The answer will be a variable expression). 3x x + 2 x + 2 5x

  2. 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. 1x + 2 1x + 2 1x + 2 + 3x + 1x + 2 + 5x (reorder terms) 1x + 3x + 1x + 5x + 2 + 2 (combine like terms) 5x 10x + 4

  3. 10) terms: 10x, 7, 3x; like terms: 10x & 3x; coefficients: 10 & 3; constant terms: 7; simplified: 13x +7 11) terms: 4y, 23, -1y, -6; like terms: 4y & -1y; 23 & -6; coefficients: 4 & -1; constant terms: 23 & -6; simplified: 3y + 17 12) terms: -19, -11a, 1a, 16; like terms: -11a & 1a, -19 & 16; coefficients: -11 & 1; constant terms: -19 & 16; simplified: -10a – 3 13) terms: 2b, -8, 4b, -6b; like terms: 2b, 4b, & -6b; coefficients: 2, 4, & -6; constant terms: -8; simplified: -8 14) terms: 9, 1n, -1, -7n; like terms: 1n & -7n, 9 & -1; coefficients: 1 & -7; constant terms: 9 & -1; simplified: -6n +8 15) terms: 8p, -5p, 5, -1p, -2; like terms: 8p, -5p & -1p; 5 & -2; coefficients: 8, -5, & -1; constant terms: 5 & -2; simplified: 2p + 3 Homework Text p.81, #10-21 all, #33-35 all

  4. Homework Text p.81, #10-21 all, #33-35 all • 16) 6x • 17) 7a • 18) -8b • 19) 6x • 20) 7c² • 21) 21y • 33) x + x + 5 + 2x + 1; 4x + 6 • 34) a + 2a + (10 – 3a); 10 • 35) 7y – 5 + 2y + 7y – 5 + 2y; 18y – 10

  5. Objective • SWBAT apply the distributive property to solve problems

  6. Evaluate. 5(11 + 2) 5(11) + 5(2) 65 This means to multiply 65

  7. Section 2.2, “The Distributive Property” DISTRIBUTIVE PROPERTY- a(b + c) = ab + ac a(b - c) = ab - ac Both of these expressions are EQUIVALENT EXPRESSIONS- meaning they have the same value.

  8. The Distributive PropertyOrder doesn’t matter… DISTRIBUTIVE PROPERTY- (b + c)a = ba + ca (b - c)a = ba - ca Both of these expressions are EQUIVALENT EXPRESSIONS- meaning they have the same value.

  9. Distributive Property Multiply across Parentheses 3(2 + 4) = 3(2) + 3(4) 3(6) = 6 + 12 18 = 18 Think of it as looking to DISTRIBUTE something

  10. 3(x + 7) -2(a + b) (8 – 7)(-9) 10(x + 2y - z) A). 3(x) + 3(7) 3x + 21 Evaluate B). -2(a) + -2(b) -2a + (-2b) or -2a – 2b C). (8)(-9) + (-7)(-9) -72 + 63 = -9 D). 10(x) + 10(2y) - 10(z) 10x + 20y - 10z

  11. Find the Area of the Figures 8 – 12w 8 – 3y 9 12 Area = length x width Area = (½)bh Area = (9)(8 – 12w) Area = (½)(12)(8 – 3y) Area = 72 – 108w units² Area = 6(8 – 3y) Area = 48 – 18y units²

  12. 3x – (x + 7) 3x + (-1)(x + 7) 3x + (-1x) + (-7) 2x + (-7) Challenge

  13. Homework Guided Practice Text p. 81, #22-30 evens -Text p.74, #12-48 evens

  14. Distributive Property Using Algebra Tiles Write an expression for the area model. =x Use the distributive property to simplify =1 = (x+2) 2x+4 2 =

More Related