Tutorial - What is an imaginary number

The video tutorial explains imaginary numbers, starting with the concept of the imaginary unit and its representation. It discusses complex numbers in the form of a + bi, where a and b are real numbers. An imaginary number is defined as a complex number where a equals zero. Examples such as 7i and -3i are provided to illustrate imaginary numbers.

What symbol is used to represent the imaginary unit?

• i

• j

• Π

• k

In the expression a + bi, what do 'a' and 'b' represent?

• Real numbers

• Whole numbers

• Complex numbers

• Imaginary numbers

Which of the following is a complex number?

• 0

• 5

• 3i

• 7 + 2i

What condition makes a complex number an imaginary number?

• When b = 0

• When a = 0

• When a > b

• When a = b

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

• 4 + 3i

• 7i

• 5

• 2 + 0i