A number which produces a specified quantity when multiplied by itself.
- The eleven chapters of Halifax's text dealt with topics such as addition, subtraction, multiplication, division, square roots and cube roots.
- Having taken then the square root of this which is 8, subtract from it half the roots, 5 leaving 3.
- The square root of 2 is an irrational number because it can't be written as a ratio of two integers.
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