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2014-12-20T12:41:08+08:00

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Just think that principal root is also the same as positive root or:
principal root=positive root

Here:
 1.) What are the square roots of 49?
Answer:   7 and -7

2.) What is the principal root of 49?
Answer:  7 (not -7 because it is negative)

Therefore, the answer of your question miss is 7.



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