Question 478896
Give the principal roots of each of the following. ( for square roots, assume the principal square is required unless the problem indicates otherwise.) 
5. √49= 7
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If that 3 indicates cube root the answer is 
6. 3√-27= -3
If the problem is 3*sqrt(-27) the answer is 3*3*sqrt(3)i
= 9sqrt(3)i

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Cheers,
Stan H.