Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October...

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Solving Polynomials 2017.notebook October 26, 2017 Warm‐Up 1. A rectangular painting has dimensions x and x + 10. The painting is in a frame 2 in. wide. The total area of the picture and the frame is 900 in 2 . What are the dimensions of the painting? 2. Your community wants to put a square fountain in a park. Around the fountain will be a sidewalk that is 3.5 ft wide. The total area that the fountain and sidewalk can be is 700ft 2 . What are the dimensions of the fountain? 3. 4.

Transcript of Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October...

Page 1: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Warm‐Up1. A rectangular painting has dimensions x and x + 10.  The painting is in a frame 2 in. wide.  The total area of the picture and the frame is 900 in2.  What are the dimensions of the painting?

2. Your community wants to put a square fountain in a park.  Around the fountain will be a sidewalk that is 3.5 ft wide.  The total area that the fountain and sidewalk can be is 700ft2.  What are the dimensions of the fountain?

3.

4.

Page 2: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Page 3: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Page 4: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Page 5: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Page 6: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Page 7: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Page 8: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Fundamental Theorem of Algebra: Any polynomial of degree n ... has n roots

but we may need to use complex (imaginary) numbers

AND imaginary roots ALWAY come in pairs

Page 9: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Page 10: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Solving Polynomials‐ Find all possible solutions.

1.   x4 + 2x3 ‐ 13x2 + 10x = 0

1. Degree: 

2. Roots:

3. End Behavior: same direction/ up

4. Calculator y=(type equation)

5. Look at graph­ determine real/complex

6. 2nd Table, look for where y=0

x = ­5,0,1,2  

Page 11: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Solving Polynomials‐ Find all possible solutions.

2.   2x4 ‐ 5x3 ‐ 17x2 + 41x ‐21 = 01. Degree: 4

2. Roots: 4

3. End Behavior: same direction/ up (even degree)

4. Calculator y=(type equation)

5. Look at graph­ determine real/complex

6. 2nd Table, look for where y=0

7. Find complex roots by synthetic division.

x=­3, 1

Page 12: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Warm­Up1)

Page 13: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

https://play.kahoot.it/#/k/58df2632­fbcc­472f­bbff­9f6446fceadd 

Page 14: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Solving Polynomials‐ Find all possible solutions.

3.   x3 ‐ 2x2 + 5x ‐ 10 = 0

1. Degree: 

2. Roots: 

3. End Behavior: (even/odd) ____________ direction(s)

4. Calculator y=(type equation)

5. Look at graph­ determine real/complex

6. 2nd Table, look for where y=0

7. Find complex roots by synthetic division.

__ real, __ complexx=

`

Page 15: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

1) When you finish, work on ALEKS HW

2) 187 Topics Due Friday! 

Page 16: Solving Polynomials 2017.notebook - cabarrus.k12.nc.us · Solving Polynomials 2017.notebook October 26, 2017 Solving Polynomials ‐ Find all possible solutions. 4. x4 + x3 ‐ 7x2

Solving Polynomials 2017.notebook October 26, 2017

Solving Polynomials‐ Find all possible solutions.

4.   x4 + x3 ‐ 7x2 ‐ 9x ‐ 18 = 0

1. Degree: 

2. Roots: 

3. End Behavior: 

4. Calculator y=(type equation)

5. Look at graph­ determine real/complex

6. 2nd Table, look for where y=0

7. Find complex roots by synthetic division.

x=

__real, __complex