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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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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
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FOIL First Outer Inner Last (x –6)(x –3)
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FOIL Now YOU try!! First Outer Inner Last (x +2)(x +4)
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What do these factors help us find?
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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.
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How would you define the zero of a function?
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Factoring when a=1
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Factoring Find the zeros of f(x) = x 2 – 6x + 8 by factoring.
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Methods of Factoring Worksheet
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Factoring Practice Do #1-3 with a partner on the “Factoring Practice” Worksheet.
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Check Your Work by Foiling! 1. (x + 9)(x + 2) 2. (y – 7)(y + 5) 3. (g – 6)(g + 2)
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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)
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Difference of Squares Find the zeros of f(x)=h 2 -81 by factoring.
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Difference of Squares Find the zeros of f(x)=49j 2 -144 by factoring.
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Methods of Factoring Worksheet
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Difference of Squares Practice Do #4-10 with a partner on the “Factoring Practice” Worksheet.
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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
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Factoring (when a ≠ 1):The Welsh Method Find the zeros of f(x) = 3x 2 + 5x - 2 by factoring.
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Factoring (when a ≠ 1):The Welsh Method Find the zeros of f(x) = 7x 2 - 5x - 2 by factoring.
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Methods of Factoring Worksheet
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Factoring (when a ≠ 1):The Welsh Method Do #11-16 with a partner on the “Factoring Practice” Worksheet.
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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
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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
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GCF (Greatest Common Factor) Find the zeros of f(x) = 4x 2 -32x +64 by factoring.
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GCF (Greatest Common Factor) Find the zeros of f(x)= 3x 4 -24x 3 +21x 2 by factoring.
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Methods of Factoring Worksheet
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GCF (Greatest Common Factor) Do #17-27 with a partner on the “Factoring Practice” Worksheet.
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GCFs and The Welsh Method
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Methods of Factoring Worksheet
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GCFs and The Welsh Method Do #28-33 with a partner on the “Factoring Practice” Worksheet.
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Picking the Right Method -?!?- 34. x 2 + 10x + 16 NOTE: WE HAVE 3 TERMS AND a=1 !!
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Picking the Right Method -?!?- 35. 5t 2 + 28t + 32 NOTE: WE HAVE 3 TERMS AND a≠1 !!
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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 !!!!!!!
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Picking the Right Method -?!?- Do #36-44 with a partner on the “Factoring Practice” Worksheet.
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Exit Ticket Find the zeros. 1) x 2 -8x-48 2) 4x 2 -49 3) 2x 2 +x-3
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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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