If the complex Z satisfies the equation Z2 + 2 = 0, Z2 =? dial the wrong number. What is Z3?

If the complex Z satisfies the equation Z2 + 2 = 0, Z2 =? dial the wrong number. What is Z3?

Z3 = Z2 (3 / 2) power = - 8 (1 / 2) power = ± 2 root sign 2I, I is an imaginary unit