# The Complex Number System

• Perform Arithmetic Operations With Complex Numbers.
• N.CN.1
Know there is a complex number i suc...
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• N.CN.2
Use the relation i2 = –1 and the c...
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• N.CN.3
(+) Find the conjugate of a complex ...
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• Represent Complex Numbers And Their Operations On The Complex Plane.
• N.CN.4
(+) Represent complex numbers on the...
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• N.CN.5
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• N.CN.6
(+) Calculate the distance between n...
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• Use Complex Numbers In Polynomial Identities And Equations.
• N.CN.7
Solve quadratic equations with real ...
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• N.CN.8
(+) Extend polynomial identities to ...
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• N.CN.9
(+) Know the Fundamental Theorem of ...
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• 3-5
• 6-8
• 9-12
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### How to Divide Complex Numbers

Practice finding conjugates and dividing complex numbers with this video and interactive tutorial.

### Imaginary Numbers Explained

Practice makes perfect when you immerse yourself in the world of imaginary numbers.

### Complex Numbers - 10 Questions

Can you answer all ten problems, using complex numbers, without making any mistakes?

### Complex Multiplication

Practice multiplying complex numbers step-by-step.

### Complex Arithmetic

Add, subtract, multiply and divide complex numbers as you polish your skills of complex arithmetic.

Use the quadratic formula to find real and complex solutions to quadratic equations.

Explore the uses, applications, and different outcomes of the quadratic formula.

### Polynomial Functions - Zeros and Multiplicities

Find complex zeros and identify multiplicity of zeros in this interactive tutorial.

Find the zeros of eight quadratic equations as quickly as possible.

### Lesson 3-2: Roots of Polynomials

Explore a third order polynomial and discover the Fundamental Theorem of Algebra.

### Absolute Value of a Complex Number

Learn how to calculate the modulus of a complex number.

### How to Divide Complex Numbers

Practice finding conjugates and dividing complex numbers with this video and interactive tutorial.

### Imaginary Numbers Explained

Practice makes perfect when you immerse yourself in the world of imaginary numbers.

### Complex Numbers - 10 Questions

Can you answer all ten problems, using complex numbers, without making any mistakes?

### Complex Multiplication

Practice multiplying complex numbers step-by-step.

### Complex Arithmetic

Add, subtract, multiply and divide complex numbers as you polish your skills of complex arithmetic.

Use the quadratic formula to find real and complex solutions to quadratic equations.

Explore the uses, applications, and different outcomes of the quadratic formula.

### Polynomial Functions - Zeros and Multiplicities

Find complex zeros and identify multiplicity of zeros in this interactive tutorial.

Find the zeros of eight quadratic equations as quickly as possible.

### Lesson 3-2: Roots of Polynomials

Explore a third order polynomial and discover the Fundamental Theorem of Algebra.

### Absolute Value of a Complex Number

Learn how to calculate the modulus of a complex number.

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