# Why is 'x' the unknown?

- Institution: TED
- Department: TED2012
- Speaker: Terry Moore
- Year: 2012
- Level: For everyone
- Language: English
- Subjects: Mathematics, History, Languages and linguistics
- Source: [TED](https://www.ted.com/talks/terry_moore_why_is_x_the_unknown)
- Licence: [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) (Non-commercial use only, and no changed versions.)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Why is 'x' the symbol for an unknown? In this short and funny talk, Terry Moore gives the surprising answer.

## Lectures

1. [Why is 'x' the unknown?](https://invisiblenetwork.ai/learn/ted/terry_moore_why_is_x_the_unknown/eea255fdd7c8), 4 min (TED's player)