Most of the roots you've worked with until now have been "square roots," meaning you're looking for the number that, when multiplied by itself, gives you the answer under the root (which is called the radicand.) Here, we look at cube roots- which means you're trying to find the number that, when multiplied by itself three times, gives you the number under the root. A cube root is notated with a little three outside the root, which is called the index. A square root doesn't have a two there, though- it's implied. Lastly, whereas we couldn't find a square root of a negative number, cube roots of negative numbers exist.
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