Unit 1  Objective 6  Roots and Radicals
The symbol is used to indicate the nth root of a number b. When n = 2 it is not necessary to put 2 in the symbol.
The sign is called the root or radical sign.
says, "what number squared is 9". 
The principal root of a positive number is defined as the positive root.
The principal root is negative when we take an odd root of a negative number.
because (2) (2) (2) = 8 
Examples:

The root of a product is the same as the product of the root of each factor.
Example:

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