Operations with Complex Numbers: A Deep Dive

This video tutorial covers operations with complex numbers, focusing on addition, subtraction, and multiplication. It begins with an introduction to complex numbers, explaining their components: real and imaginary numbers. The tutorial then demonstrates how to add and subtract complex numbers by combining like terms and distributing negatives. It also covers multiplication using methods like double distribution and the box method. The video concludes with a summary and encourages students to prepare questions for further discussion in class.

What is the goal by the end of the video?

• To solve all problems correctly

• To memorize all formulas

• To feel comfortable enough to attempt a problem on your own

• To understand the history of complex numbers

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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 is the value of i squared?

• 1

• -1

• 0

• i

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CCSS.HSN.CN.A.1

How do you combine like terms in complex numbers during addition?

• Subtract real parts and add imaginary parts

• Add real parts and subtract imaginary parts

• Add real parts and add imaginary parts

• Subtract real parts and subtract imaginary parts

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CCSS.7.NS.A.1C

What is the result of 2 + 6 + 5i - 4i?

• 8 + i

• 8 - i

• 6 + i

• 6 - i

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CCSS.HSN.CN.A.2

Which method can be used to multiply binomials?

• Double distribution

• Box method

• Both double distribution and box method

• Neither double distribution nor box method

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What is the result of multiplying 4 + 3i and 2 - 4i using the box method?

• 8 - 10i

• 20 + 10i

• 20 - 10i

• 8 + 10i

What happens to i squared during multiplication of complex numbers?

• It becomes 0

• It remains i squared

• It becomes -1

• It becomes 1

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CCSS.HSN.CN.A.2

What is the final result of multiplying 1 - 7i and -2 + 3i?

• 19 + 17i

• 19 - 17i

• 17 - 19i

• 17 + 19i

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CCSS.HSN.CN.A.2

What should students bring to the next class?

• Completed homework

• A calculator

• Questions, comments, or concerns

• Their textbooks

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CCSS.RI.9-10.5

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