Exploring Operations with Complex Numbers

Professor Dave introduces complex numbers, explaining their components and operations. He covers real and imaginary numbers, how to perform arithmetic with complex numbers, and the use of complex conjugates for division. The video also discusses the application of complex numbers in solving polynomials, emphasizing their importance in mathematics.

What is the simplest imaginary number?

• i

• sqrt(2)

• pi

• e

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CCSS.HSN.CN.A.1

Why do we need the imaginary unit 'i'?

• To calculate integrals

• To solve linear equations

• To represent the square root of negative numbers

• To find the area of a circle

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CCSS.HSN.CN.A.1

What is the value of i squared?

• 0

• i

• -1

• 1

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CCSS.HSN.CN.A.1

What is the value of i to the fourth power?

• -i

• 1

• -1

• i

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CCSS.HSN.CN.A.2

How do you express the square root of a negative number?

• As a complex number

• As a rational number

• As an imaginary number

• As a real number

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CCSS.HSN.CN.A.1

What is the standard form of a complex number?

• A / BI

• A + BI

• A - BI

• A * BI

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CCSS.HSN.CN.A.1

What happens when you multiply a complex number by its complex conjugate?

• You get zero

• You get a real number

• You get an imaginary number

• You get a complex number

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CCSS.HSN.CN.C.8

What is the result of (2 - i) * (4 + 2i)?

• 6 - 2i

• 4 + 4i

• 10

• 8 + 2i

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CCSS.HSN.CN.A.2

What is the complex conjugate of 3 - i?

• 3 - i

• -3 - i

• -3 + i

• 3 + i

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CCSS.HSN.CN.A.3

What theorem states that a polynomial of degree N will always have N linear factors?

• Imaginary Number Theorem

• Quadratic Formula

• Linear Factorization Theorem

• Fundamental Theorem of Algebra

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CCSS.HSN.CN.C.9