7
QuizMultiple Choice
Powers and Roots of Complex Numbers
Question 7 • *PGHS Precalculus B
Which expression represents a cube root of –8?
Answer
A
2 (cosine ( StartFraction pi over 6 EndFraction) plus i sine (StartFraction pi over 6 EndFraction))
B
2 (cosine ( StartFraction pi over 4 EndFraction) plus i sine (StartFraction pi over 4 EndFraction))
C
2 (cosine ( StartFraction pi over 3 EndFraction) plus i sine (StartFraction pi over 3 EndFraction))
D
2 (cosine ( StartFraction pi over 2 EndFraction) plus i sine (StartFraction pi over 2 EndFraction))