Chapter 6 - Section 6.5 - Complex Numbers in Polar Form; DeMoivre's Theorem - Exercise Set - Page 769: 109

The statement doesn’t make sense.

According to DeMoivre’s Theorem, any complex number has $n$ distinct ${{n}^{th}}$ roots. Hence, according to this theorem $8$ must have $3$ distinct cube roots. The above statement is violating DeMoivre’s Theorem for finding roots of a complex number and therefore the statement doesn’t make sense.