# Negative Frequencies

Discover negative frequencies and where they are located.

## We'll cover the following

The idea of a complex sinusoid can easily be extended to discover negative frequencies. This will help us establish the concept of the frequency domain, which we will discuss in detail later.

## Direction and negative numbers

Think about negative numbers. They were shrouded in mystery in the early years of mathematical exploration. before it was discovered that they can be associated with the idea of direction.

- For example, you owe me $-100$ dollars if I am the one in debt.
- Similarly, heading $+4$ km or $-4$ km determines whether we travel towards the east or the west.

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