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Radicals are numbers with roots. They get the nth root of a whole number.

Ex.  \sqrt{8} =2 \sqrt{2}
simplifying radicals (For extra info; applicable to roots)
You get the prime factorization of the number and if ever there is a number to the nth power then it will be outside the nth root sign and the remaining inside.
 \sqrt[3]{16} =2 \sqrt[3]{2}

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