Operations with Complex Numbers: Addition, Subtraction, Multiplication, and Division

This video tutorial introduces complex numbers, explaining their composition of real and imaginary parts. It covers the imaginary unit 'i', defined as the square root of negative one, and demonstrates operations such as addition, subtraction, multiplication, and division of complex numbers. The tutorial emphasizes the standard form a + bi and explains how to handle complex numbers in division by using conjugates to eliminate 'i' from the denominator.

What is a complex number composed of?

• Only a real part

• Neither real nor imaginary part

• A real part and an imaginary part

• Only an imaginary part

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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 does the imaginary unit 'i' represent?

• Square root of 1

• Square root of 2

• Square root of 0

• Square root of -1

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CCSS.HSN.CN.A.1

What is the result of i squared (i^2)?

• -1

• 0

• i

• 1

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CCSS.HSN.CN.A.2

How do you add the complex numbers 3 + 2i and 4 - 5i?

• 7 - 3i

• 7 + 3i

• -1 + 7i

• -1 - 7i

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CCSS.HSN.CN.A.2

What is the result of subtracting 4 - 5i from 3 + 2i?

• -1 - 7i

• -1 + 7i

• 1 + 3i

• 1 - 3i

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CCSS.HSN.CN.A.2

When multiplying (3 + 2i) and (4 - 5i), what is the result?

• 20 - 7i

• 20 + 7i

• 20 - 3i

• 20 + 3i

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CCSS.HSN.CN.A.3

What is the first step in dividing complex numbers?

• Subtract the denominators

• Divide the real parts

• Multiply by the complex conjugate

• Add the numerators

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CCSS.HSN.CN.A.3

What is the result of dividing 3 + 2i by 4 - 5i?

• 23/41 + 2/41i

• 23/41 - 2/41i

• 2/41 - 23/41i

• 2/41 + 23/41i

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CCSS.HSN.CN.A.3

How do you handle a monomial in the denominator when dividing complex numbers?

• Multiply by the numerator

• Subtract the imaginary part

• Multiply by i over i

• Add the real part

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CCSS.HSN.CN.A.3