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Giving unknown numbers a set of rules
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Ages 7–9Al-Karaji developed algebra after the work of al-Khwarizmi.
His work treated algebraic quantities using operations such as multiplication.
He described powers such as x, x squared, and x cubed, and rules for multiplying them.
A school of algebra developed around his work, and later scholars such as al-Samawal continued it.
PAUSE & WONDER
How can one rule describe many different number examples?
PAUSE & WONDER