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Day 1 Lesson Essential Question: How can I use a variety of methods to completely factor expressions and equations?

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Presentation on theme: "Day 1 Lesson Essential Question: How can I use a variety of methods to completely factor expressions and equations?"— Presentation transcript:

1 Day 1 Lesson Essential Question: How can I use a variety of methods to completely factor expressions and equations?

2 Warm Up Multiply the following binomials. 1) (x+3)(x-2) 2) (x-5)(x-1) 3) (2x+5)(x+1) x 2 +x-6 x 2 -6x+5 2x 2 +7x+5

3 FOIL First Outer Inner Last (x –6)(x –3)

4 FOIL Now YOU try!! First Outer Inner Last (x +2)(x +4)

5 What do these factors help us find?

6 Graph this on your calculator. When a soccer ball is kicked into the air, how long will the ball take to hit the ground? The height h in feet of the ball after t seconds can be modeled by the quadratic function h(t) = –16t 2 + 32t. In this situation, the value of the function represents the height of the soccer ball. When the ball hits the ground, the value of the function is zero.

7 How would you define the zero of a function?

8 Factoring when a=1

9 Factoring Find the zeros of f(x) = x 2 – 6x + 8 by factoring.

10 Methods of Factoring Worksheet

11 Factoring Practice Do #1-3 with a partner on the “Factoring Practice” Worksheet.

12 Check Your Work by Foiling! 1. (x + 9)(x + 2) 2. (y – 7)(y + 5) 3. (g – 6)(g + 2)

13 Difference of Squares When we use it: ◦ Usually in the form ax 2 – c ◦ Both a and c are perfect squares (the square root of each number is a whole number)

14 Difference of Squares Find the zeros of f(x)=h 2 -81 by factoring.

15 Difference of Squares Find the zeros of f(x)=49j 2 -144 by factoring.

16 Methods of Factoring Worksheet

17 Difference of Squares Practice Do #4-10 with a partner on the “Factoring Practice” Worksheet.

18 Factoring (when a ≠ 1):The Welsh Method Steps: 1. Multiply c and a 2. Rewrite the expression with the new value for c 3. Write (ax + )(ax + ) 4. Finish “factoring” the new expression 5. Reduce each set of parentheses by any common factors

19 Factoring (when a ≠ 1):The Welsh Method Find the zeros of f(x) = 3x 2 + 5x - 2 by factoring.

20 Factoring (when a ≠ 1):The Welsh Method Find the zeros of f(x) = 7x 2 - 5x - 2 by factoring.

21 Methods of Factoring Worksheet

22 Factoring (when a ≠ 1):The Welsh Method Do #11-16 with a partner on the “Factoring Practice” Worksheet.

23 GCF (Greatest Common Factor) When we use it: all the terms share 1 or more factors Factoring out GCFs save us time!!! ◦ 4x 2 – 196 = 0 ◦ (2x + 14)(2x – 14) = 0

24 GCF (Greatest Common Factor) Steps: 1. Identify any common factor(s) (including the GCF) 2. Factor out the common factor(s) 3. Factor the remaining expression if possible

25 GCF (Greatest Common Factor) Find the zeros of f(x) = 4x 2 -32x +64 by factoring.

26 GCF (Greatest Common Factor) Find the zeros of f(x)= 3x 4 -24x 3 +21x 2 by factoring.

27 Methods of Factoring Worksheet

28 GCF (Greatest Common Factor) Do #17-27 with a partner on the “Factoring Practice” Worksheet.

29 GCFs and The Welsh Method

30 Methods of Factoring Worksheet

31 GCFs and The Welsh Method Do #28-33 with a partner on the “Factoring Practice” Worksheet.

32 Picking the Right Method -?!?- 34. x 2 + 10x + 16 NOTE: WE HAVE 3 TERMS AND a=1 !!

33 Picking the Right Method -?!?- 35. 5t 2 + 28t + 32 NOTE: WE HAVE 3 TERMS AND a≠1 !!

34 Picking the Right Method -?!?- 16p 2 – 9 NOTE: WE HAVE 2 TERMS WITH A MINUS IN THE MIDDLE AND BOTH TERMS ARE A PERFECT SQUARE !!!!!!!

35 Picking the Right Method -?!?- Do #36-44 with a partner on the “Factoring Practice” Worksheet.

36 Exit Ticket Find the zeros. 1) x 2 -8x-48 2) 4x 2 -49 3) 2x 2 +x-3

37 Warm Up Factor Completely (5 minutes) 1) x 2 -13x+36 2) x 2 -144 3) 6x 2 +13x+6 (x-4)(x-9) (x+12)(x-12) (3x+2)(2x+3)


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