5. Find the polar representation of (i ) 6. Find all the values ofX so that x4 = 8(i ) 7. Given 2 not real and |z| = 1, Show that w = g is a pure imaginary number 8. Calculate all integers n such that Zn = [(1 + \"Ennis a real number 9. Calculate the real values of x and y such that (x + 30%.? bigger than 8 10. Find real values of the number \"a\" from which ai is a solution of the polynomial equation x4 2x3 + 7x2 42 + 10 = 0. Then find the roots of this equation. 11. Calculate the values of \"m\" such that the roots: x1 and x2 of x2 21113: + m = 0 satisfy the condition xf + x23 = x12 + x3. 12. Find the 4 4th roots of4 + 10i 13. Find the 2 square roots of 3 -Si 14. Find the 9 9th roots of 12-13i