Tutorial - Finding the absolute value of a complex number ex 4, (-8i)

The video tutorial explains how to identify and work with complex numbers, focusing on imaginary numbers where the real part (A) is zero. It demonstrates how to determine the values of A and B in a complex number and calculates the absolute value of an imaginary number, using the example of -8i. The process involves squaring the imaginary part and taking the square root to find the absolute value.

What is the real part of an imaginary number?

• It can be any number.

• It is always -1.

• It is always 0.

• It is always 1.

When is a complex number considered imaginary?

• When the imaginary part is zero.

• When the real part is zero.

• When both parts are non-zero.

• When both parts are zero.

What is the imaginary part of the complex number -, 8 I?

• 1

• 8

• -8

• 0

How do you calculate the absolute value of a complex number?

• By subtracting the imaginary part from the real part.

• By multiplying the real and imaginary parts.

• By taking the square root of the sum of the squares of the real and imaginary parts.

• By adding the real and imaginary parts.

What is the absolute value of the complex number -, 8 I?

• -8

• 8

• 0

• 64