Pre calc help please !!!

Question

 Find the cube roots of the following:

Answer 1

216^1/3 = 6

cis(x) = e^ix

(e^ix)^1/3 = e^ix/3 = cis(x/3)

(216cis(π/2)^1/3 = 6cis(π/6) = 6(cos(π/6) + isin(π/6) = 6(√3/2 + i/2) = 3√3+3i