# 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
(+) Represent addition, subtraction,...
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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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### Grade level

• K-2
• 3-5
• 6-8
• 9-12
• math_attach
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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.

### Solving Quadratic Equations- The Quadratic Formula (self-test)

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

### Quadratic Formula (ASSET)

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.

### Quadratic Formula

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.

### Solving Quadratic Equations- The Quadratic Formula (self-test)

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

### Quadratic Formula (ASSET)

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.

### Quadratic Formula

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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