What is the square root of a negative number?
3.2 Mixed Practice

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•
Mathematics
•
11th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
Back
2.
FLASHCARD QUESTION
Front
Back
3.
FLASHCARD QUESTION
Front
How do you multiply two complex numbers, such as (2 + 6i) and (4 + 9i)?
Back
Multiply using the distributive property: (2 + 6i)(4 + 9i) = 8 + 18i + 24i + 54i^2 = -46 + 42i.
4.
FLASHCARD QUESTION
Front
What is the sum of two complex numbers, (9 - i) and (-7 + 8i)?
Back
The sum is 2 + 7i, calculated as (9 - 7) + (-1 + 8)i.
5.
FLASHCARD QUESTION
Front
How do you subtract complex numbers, such as (-9 + 8i) - (3 + 2i)?
Back
Subtract by combining real and imaginary parts: (-9 - 3) + (8 - 2)i = -12 + 6i.
6.
FLASHCARD QUESTION
Front
What is an imaginary number?
Back
7.
FLASHCARD QUESTION
Front
What is the formula for multiplying two complex numbers?
Back
The formula is (a + bi)(c + di) = (ac - bd) + (ad + bc)i.
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