What is the difference between imanginary numbers and complex numbers

The video tutorial introduces the concept of imaginary units, represented by 'i', which is the square root of negative one. It explains imaginary numbers as multiples of 'i' with real coefficients, such as 5i. The tutorial then covers complex numbers, which are composed of a real part 'a' and an imaginary part 'bi'. The importance of writing complex numbers in the form a + bi is emphasized, along with examples and clarifications on how to handle subtraction in this context.

What is the imaginary unit 'i' defined as?

• The square root of 2

• The square root of 0

• The square root of -1

• The square root of 1

Which of the following is an example of an imaginary number?

• 3 + 4i

• i + 1

• 5i

• 7

In the expression 6i, what does the '6' represent?

• A variable

• An imaginary unit

• A complex number

• A real number

How should complex numbers be written to receive full credit?

• In the form a - bi

• In the form bi + a

• In the form a + bi

• In the form a * bi

What is the real part of the complex number 3 - 4i?

• 3

• -4

• 4

• i