Question 91739
How would you explain square roots:  a number that is multiplied twice.
For example:  the square root of 9 is 3 because 3x3=9.  Three is the number that is multiplied twice to equal 9.

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cube roots:  a number that is multiplied three times.  For example:
The third root of 27 is 3 because 3x3x3=27.  The number (3) is multiplipied three times to equal 27. 
Another example:  the third root of 64 is 4 because 4 is multiplied three times to equal 64 (4x4x4=64) 

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nth roots:  a number that is multiplied nth number of times to equal the radicand (the number underneath the radical sign).
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What are some limitations of square root? the radicand must always be equal to or greater than zero (a positive number).  Because squaring any number will result in a positive number.  For example:
(-2)(-2)=4
and (+2)+2)=4 also.
Therefore the square root of 4 is +2 or -2.