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BELL RINGER MM1A2c & MM1A1h Find the sum or difference. 1. (3m 3 + 2m + 1) + (4m 2 – 3m + 1) 2. (14x 4 – 3x 2 + 2) – (3x 3 + 4x 2 + 5) 3. Determine whether the function f(x) = is even, odd, or neither.

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Essential Question

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Daily Standard & Essential Question MM1A2c :Add, subtract, multiply, and divide polynomials MM1A2g: use area and volume models for polynomials arithmetic Essential Question: What are the three special products and how can you quickly find each one?

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There are formulas (shortcuts) that work for certain polynomial multiplication problems. (a + b) 2 = a 2 + 2ab + b 2 (a - b) 2 = a 2 – 2ab + b 2 (a - b)(a + b) = a 2 - b 2 Being able to use these formulas will help you in the future when you have to factor. If you do not remember the formulas, you can always multiply using distributive, FOIL, or the area model method.

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Lets try one! 1) Multiply: (x + 4) 2 You can multiply this by rewriting this as (x + 4)(x + 4) OR You can use the following rule as a shortcut: (a + b) 2 = a 2 + 2ab + b 2 For comparison, Ill show you both ways.

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1) Multiply (x + 4)(x + 4) First terms: Outer terms: Inner terms: Last terms: Combine like terms. x 2 +8x + 16 x+4 x x 2 +4x +16 Now lets do it with the shortcut! x2x2 +4x +16 Notice you have two of the same answer?

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1) Multiply: (x + 4) 2 using (a + b) 2 = a 2 + 2ab + b 2 a is the first term, b is the second term (x + 4) 2 a = x and b = 4 Plug into the formula a 2 + 2ab + b 2 (x) 2 + 2(x)(4) + (4) 2 Simplify. x 2 + 8x+ 16 This is the same answer! Thats why the 2 is in the formula!

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2)Multiply: (3x + 2y) 2 using (a + b) 2 = a 2 + 2ab + b 2 (3x + 2y) 2 a = 3x and b = 2y Plug into the formula a 2 + 2ab + b 2 (3x) 2 + 2(3x)(2y) + (2y) 2 Simplify 9x xy +4y 2

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Multiply: (x – 5) 2 using (a – b) 2 = a 2 – 2ab + b 2 Everything is the same except the signs! (x) 2 – 2(x)(5) + (5) 2 x 2 – 10x ) Multiply: (4x – y) 2 (4x) 2 – 2(4x)(y) + (y) 2 16x 2 – 8xy + y 2

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5) Multiply (x – 3)(x + 3) First terms: Outer terms: Inner terms: Last terms: Combine like terms. x 2 – 9 x-3 x +3 x 2 +3x -3x -9 This is called the difference of squares. x2x2 +3x -3x -9 Notice the middle terms eliminate each other!

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5) Multiply (x – 3)(x + 3) using (a – b)(a + b) = a 2 – b 2 You can only use this rule when the binomials are exactly the same except for the sign. (x – 3)(x + 3) a = x and b = 3 (x) 2 – (3) 2 x 2 – 9

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6) Multiply: (y – 2)(y + 2) (y) 2 – (2) 2 y 2 – 4 7) Multiply: (5a + 6b)(5a – 6b) (5a) 2 – (6b) 2 25a 2 – 36b 2

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Homework Textbook Page 70; 2 – 20 Even

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