Find All Cube Roots of the Complex Number $$- 64 i$$

question 289

Multiple Choice

Find all cube roots of the complex number. Leave answers in trigonometric form.
- $$- 64 i$$

• A) \(4 \operatorname { cis } 90 ^ { \circ } , 4\) cis \(^ { \circ } 210,4\) cis \(330 ^ { \circ }\)
• B) 4 cis \(90 ^ { \circ } , 4 \operatorname { cis } ^ { \circ } 180,4\) cis \(270 ^ { \circ }\)
• C) \(4 \operatorname { cis } 30 ^ { \circ } , 4\) cis \(^ { \circ } 60,4 \operatorname { cis } 90 ^ { \circ }\)
• D) 4 cis \({ } ^ { \circ } 210 , , 4 \operatorname { cis } 270 ^ { \circ } , 4 \operatorname { cis } 330 ^ { \circ }\)

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