Complex Number Operations and Properties

The video tutorial covers the multiplication of complex numbers, including the use of the imaginary unit i, which is the square root of -1. It explains how to multiply complex numbers, including negative complex numbers and binomials, and demonstrates the FOIL method. The tutorial also covers the multiplication of complex conjugates, showing how the imaginary parts cancel out to yield a real number. Additionally, it explains how to handle square roots of negative numbers in complex multiplication.

What is the result of multiplying 7i by 8i?

• -56

• 56i

• -56i

• 56

Tags

CCSS.HSN.CN.A.1

What is the imaginary unit i equal to?

• 1

• -1

• √-1

• √1

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CCSS.HSN.CN.A.2

When multiplying -4i by -3i, what is the result?

• 12i

• -12i

• -12

• 12

Tags

CCSS.HSN.CN.C.8

How do you express the product of 5i and (3 + 4i) in standard form?

• -20 + 15i

• 15 + 20i

• 20 - 15i

• -15 + 20i

Tags

CCSS.HSN.CN.A.2

What is the result of multiplying the square root of -6 by the square root of -30?

• 6√5i

• -6√5

• 6√5

• -6√5i

Tags

CCSS.HSN.CN.A.2

What is the product of the square root of -25 and the square root of -9?

• 15i

• -15i

• -15

• 15

Tags

CCSS.HSN.CN.A.2

What is the result of multiplying (3 + 4i) by (5 - 2i) using the FOIL method?

• 23 + 14i

• 23 - 14i

• 14 + 23i

• 14 - 23i

Tags

CCSS.HSN.CN.C.8

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

• You get zero

• You get a complex number

• You get an imaginary number

• You get a real number

Tags

CCSS.HSN.CN.C.8

What is the result of multiplying (6 + 4i) by (6 - 4i)?

• 36

• 16

• 52

• 0

Tags

CCSS.HSN.CN.C.8

What is the expanded form of (2 + 3i)^2?

• 4 - 12i + 9

• 4 + 12i - 9

• 5 - 12i

• -5 + 12i

Tags

CCSS.HSN.CN.C.8