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Mathematics Definitions by Weiqin

7. In mathematics, a square root of a number '*x'* is a number '*r'* such that "*r*^{2} = *x"*, or, in other words, a number '*r'* whose *square* (the result of multiplying the number by itself, or '*r* ×*r'*) is *x*.

8. In mathematics, a cube root of a number, denoted "x^{1/3"}, is a number '*a'* such that "*a*^{3} = *x"*. All real numbers have exactly one real cube root.
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