Operations with Complex Numbers

This video tutorial covers operations with complex numbers, including addition, subtraction, multiplication, and division. It explains how to handle the real and imaginary parts separately and introduces the concept of complex conjugates. The video also discusses powers of the imaginary unit 'i' and provides examples to illustrate each operation. A graphing calculator is used to verify results, ensuring a comprehensive understanding of complex number operations.

What is the result of adding the complex numbers 3 + 4i and 7 - 5i?

• 10 - i

• 10 + i

• 10 - 9i

• 10 + 9i

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CCSS.HSN.CN.A.2

When subtracting the complex numbers -2 - 4i and 7i, what is the result?

• 0

• 2 - 7i

• 2 + 7i

• 2

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CCSS.HSN.CN.A.2

How do you multiply two complex numbers, such as (5 - 2i) and (5 - 2i)?

• Expand like binomials and simplify

• Multiply imaginary parts only

• Multiply real parts only

• Add the numbers directly

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CCSS.HSN.CN.A.2

What is the simplified form of (6 - 8i) * (9i - 12i^2)?

• 18 + i

• 18 - 9i

• 18 - i

• 18 + 9i

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CCSS.HSN.CN.C.8

What is the result of multiplying a complex number by its conjugate?

• An imaginary number

• A complex number

• Zero

• A real number

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CCSS.HSN.CN.C.8

What is the product of the complex numbers 7 + 2i and 7 - 2i?

• 51

• 49

• 53

• 55

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CCSS.HSN.CN.A.2

What is the value of i raised to the 5th power?

• 1

• -i

• -1

• i

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CCSS.HSN.CN.A.2

If i is raised to an even power, what will the result be?

• 1 or -1

• i

• -i

• 0

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CCSS.HSN.CN.A.3

How do you divide complex numbers like (4 + 2i) by (5 - 3i)?

• Multiply by the conjugate of the numerator

• Multiply by the conjugate of the denominator

• Add the conjugate of the denominator

• Subtract the conjugate of the numerator

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CCSS.HSN.CN.A.3

What is the simplified form of dividing (4 + 2i) by (5 - 3i)?

• 11/17 + 7/17i

• 11/17 - 7/17i

• 7/17 - 11/17i

• 7/17 + 11/17i

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CCSS.HSN.CN.A.3