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.

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

1. What is Algebra?: Solving for unknowns - Head First Algebra [Book]

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Daniel W. Hieber on LinkedIn: X marks the unknown in algebra – but

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Scissors congruence,' an ancient geometric idea that's still fueling cutting-edge mathematical research

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Algebra II.pdf

Science Stories Department Of Mathematics Page, SBASSE

What is Algebra - Answered - Twinkl Teaching Wiki - Twinkl