Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.
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Transcript of Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.
![Page 1: Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.](https://reader036.fdocuments.us/reader036/viewer/2022090107/5a4d1bda7f8b9ab0599dbeb3/html5/thumbnails/1.jpg)
Multiplying Polynomials Multiplying Polynomials and Special Products of and Special Products of
BinomialsBinomials1-5 and 1-61-5 and 1-6
Unit 1Unit 1English CasbarroEnglish Casbarro
![Page 2: Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.](https://reader036.fdocuments.us/reader036/viewer/2022090107/5a4d1bda7f8b9ab0599dbeb3/html5/thumbnails/2.jpg)
Warm-up: Answer the following questions.1. What is the degree of the monomial 5x y 4z ? A. 6 B. 1 C. 4 D. 5
2. For f(x) = 2x 2 + 4x – 6 and g(x) = 2x 2 + 2x - 8, find f(x) – g(x). A. – 4x 2 – 2x + 2 B. 2x + 2 C. 4x 2 + 6x + 2 D. 2x – 14
3. Which polynomial is written in standard form? A. 7 + 2x 4 – x 6 B. 3x 3 – x 5 C. x 4 D. x 2 + 3 – 2x
4. What is the degree of the polynomial function h(x) = 7x 3 – x 6 + x A. 10 B. 3 C. – 1 D. 6
5. Short Response Evaluate for x = –2
P(x) and R(x) are polynomials. P(x) is a trinomial. Give examples of P(x) and R(x) that meet the following conditions.
6. P(x) – R(x) is a binomial.
7. P(x) – R(x) is a polynomial with 4 terms.
8. P(x) is a quartic.
821 23 xx
![Page 3: Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.](https://reader036.fdocuments.us/reader036/viewer/2022090107/5a4d1bda7f8b9ab0599dbeb3/html5/thumbnails/3.jpg)
1-5: Multiplying Monomials Remember! When multiplying powers with the same base, keep the base
and add the exponents. x 2 · x 3 = x2+3 = x5
You will multiply the coefficients by each other just like you always have done.
(5)(4) = 20
So, when you put the two items together, you have two monomials:
(5x2)(4x3) = 20x5
![Page 4: Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.](https://reader036.fdocuments.us/reader036/viewer/2022090107/5a4d1bda7f8b9ab0599dbeb3/html5/thumbnails/4.jpg)
Example 1: (–3x 3y 2)(4xy 5) = (–3 · 4)(x 3· x)(y 2· y 5) = (-12)(x 3 + 1)(y 2 + 5)= -12x 4y 7
Example 2:
Now you try: a. b. c.
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Multiplying monomials and polynomials Remember the distributive property
when you are multiplying larger polynomials. The rules of the exponents are still true, but you have several terms that you now how to distribute.
![Page 6: Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.](https://reader036.fdocuments.us/reader036/viewer/2022090107/5a4d1bda7f8b9ab0599dbeb3/html5/thumbnails/6.jpg)
Example 1:
Example 2:
You try:
a. b. c.
![Page 7: Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.](https://reader036.fdocuments.us/reader036/viewer/2022090107/5a4d1bda7f8b9ab0599dbeb3/html5/thumbnails/7.jpg)
Multiplying 2 binomials
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You also can think of it as the double distributive– First, I have to multiply x by everything in the second parenthesis. Then I have to come through again and multiply 3 by everything in the second parenthesis.
(x + 3)(x + 2) = x(x + 2) + 3(x + 2)
= x(x) + x(2) + 3(x) + 3(2)
= x 2 + 2x + 3x + 6
= x 2 + 5x + 6
![Page 9: Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.](https://reader036.fdocuments.us/reader036/viewer/2022090107/5a4d1bda7f8b9ab0599dbeb3/html5/thumbnails/9.jpg)
Special products of binomials You also need to be aware of 2 special
types:1) (a – b)(a + b)=a2 – b2
2) (a – b)2 = a2 – 2ab + b2
(a + b)2= a2 + 2ab + b2
They multiply just like any other binomials, but later you will be factoring, and it will help you to remember these.
![Page 10: Multiplying Polynomials and Special Products of Binomials 1-5 and 1-6 Unit 1 English Casbarro.](https://reader036.fdocuments.us/reader036/viewer/2022090107/5a4d1bda7f8b9ab0599dbeb3/html5/thumbnails/10.jpg)
Example 1:(a – b)(a + b) = a(a) + a(b) – b(a) – b(b) = a 2 + ab – ab - b 2
= a 2 – b 2
Example 2: (a + b)2 = (a + b)(a + b) = a 2 + a(b) + b(a) – b(b)
= a 2 + ab + ab - b 2
= a 2 + 2ab + b 2
Huge Note: Make sure that when you have a binomial squared, that you first write outthe 2 binomials side by side.
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Example 1:(x + 4)2 = (x + 4)(x + 4) = x2 + 4x + 4x + 16 = x2 + 8x + 16
Example 2:(3x + 2y)2 = (3x + 2y)(3x + 2y) = (3x)(3x) + (3x)(2y) + (3x)(2y) + (2y)(2y) = 9x2 + 6xy + 6xy + 4y2
= 9x2 + 12xy + 4y2
You try: a. (x – 5)2 b. (6x -5)2
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Exponent Rulesam · an = am+n
(am)n = amn
(ab)m=ambm
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Turn in the following problems.1. Marie is planning a garden. She designs a rectangular garden with a length of (x + 4) and a width of (x + 1) feet. a. Draw a diagram of the garden and label it. b. Write a polynomial that represents the area of Marie’s garden. c. Find the area when x = 5.2. Copy and complete the table below.
A Degree of A B Degree
of B A·B Degree of AB
2x2 2 3x5 5 6x7 7
5x3 2x2 + 1
x2 + 2 x2 – x
x – 3 x3 – 2x2 + 1
a.
b.
c.
d. Use the results of the chart to complete the following: The product of a polynomial of degree m and a polynomial of degree n, has a degree of_______.