4. (15 points) Find all the complex solutions of the equation z* + (V3 - 30) (1+2)*=0. Express the results in Cartesian form (you may express your answer as a function of k, e.g. z = el(ka/?) = cos(kx/2) + isin(kx/2), k = 0, 1,2,3, without explicitly evaluating the expression for each )