Al-Khwarizmi — "The square of the unknown is equal to the number."
The square of the unknown is equal to the number.
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More from Al-Khwarizmi
"What is easiest and most useful in arithmetic, such as men frequently require in cases of inheritance, legacies, partition, lawsuits, and trade."
"The art of calculation is indispensable in commerce and daily life."
"The science of algebra is a noble one, necessary for men."
"The method of calculation must be clear and simple."
"Numbers are the roots of all calculations."
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