Why is 'x' the unknown? | Terry Moore Why is 'x' the unknown? | Terry Moore begin-post-stats TED • 509K views end-post-stats begin-duration 3:58 end-duration Math topics: _Mathematics_##Mathematics##_Mathematics_##Mathematics##_Algebra_##Algebra##_Mathematical_proof_##Mathematical proof Other topics: _Scripts_with_iso_15924_four-letter_codes_##Scripts with iso 15924 four-letter codes##_Arabic_script_##Arabic script##_Latin_alphabet_##Latin alphabet##_Arabic_alphabet_##Arabic alphabet##_Chronology_##Chronology##_Common_Era_##Common Era##_12th_century_##12th century##_Century_##Century##_Civilizations_##Civilizations##_Ancient_Greece_##Ancient Greece##_Arabs_##Arabs##_Ancient_Greek_##Ancient Greek##_Grammar_##Grammar##_Question_##Question##_Article_(grammar)_##Article (grammar)##_Phrase_##Phrase video-id: YX_OxBfsvbk channel_TED_ So What Learning Chronology , Civilizations , Grammar , Mathematics , Scripts with iso 15924 four-letter codes Sunday, January 21, 2018 Share Share