Radicals: Introduction & Simplification | Purplemath
https://www.purplemath.com/modules/radicals.htm
WebPurplemath. "Roots" (or "radicals") are the "opposite" operation of applying exponents; we can "undo" a power with a radical, and we can "undo" a radical with a power. For instance, if we square 2, we get 4, and if we "take the square root of 4 ", we get 2; if we square 3, we get 9, and if we "take the square root of 9 ", we get 3.
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