X marks the unknown in algebra – but X's origins are a math mystery

How did the letter x get its enduring role as a symbol of the unknown? A mathematician explains why it’s hard to say for sure.

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X marks the unknown in - Учебен център Sofia-Math / София-Мат

Find the Value of x, and the Missing Angle Measures

X marks the unknown in algebra – but X's origins are a math mystery - World leading higher education information and services

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Algebra Math Mystery - Case of the Alien Apocalypse – 7th Grade Math Worksheets

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View question - Why do we use x to represent an unknown number?

What is the 'X' Symbol? 6 Powerful Meanings

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Who created the alphabet? A historian describes the millennia-long

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