Find all specified roots.Seventh roots of 1.

A. 1, cis , cis , cis , cis , cis , cis 
B. -1, cis , cis , cis , cis , cis , cis 
C. 1, cis , cis , cis , cis , cis , cis 
D. 1, cis , cis , cis , cis , cis , cis , -1


Answer: C

Mathematics

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A. Yes B. No

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Factor out the greatest common factor. Be sure that the coefficient of the term of highest degree is positive.-21a3 + 15a

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Mathematics