Complex Numbers and Imaginary Numbers Flashcards Preview

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Flashcards in Complex Numbers and Imaginary Numbers Deck (14)
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1

TRUE/FALSE:
It is possible to take the square root of a negative number.

TRUE

2

What is this: "i" = √-1

Imaginary unit

3

The _________ ___ can be used as a part of the square root of ANY negative number.

imaginary "i"

4

What is the complex form for imaginary numbers?

a + b"i"
or
a - b"i"
where a and b are real numbers.

5

A _______ ______ is any number that can be written in the form a + b"i."

complex number

6

In complex form, a is called...

the real part.

7

In complex form, b"i" is called...

the imaginary part.

8

What always works, even by imaginary numbers?

Quadratic formula

9

What axis do imaginary numbers not hit?

The x-axis.

10

What can't you forget in writing the answer for a problem in complex form?

The plus/minus notation.

11

How do you add and subtract complex numbers?

Add/subtract the real parts and the imaginary parts separately.

12

How do you multiply complex numbers?

Use FOIL and distributive property, just like with "regular polynomials"

13

Remember that i^2 =

-1

14

When using a calculator to solve problems with complex numbers, remember to write

the negative answer also.