D) 20 9. o (cube roots of unity) is equal to a) (-1/2)+iv3/2 b) (1/2)-iv3/2 c)(1/2)+iv3/2 d (-1/2)-iv3/2 ) 10. the equation of third degree with real coefficien

d) 20 9. o (cube roots of unity) is equal to a) (-1/2)+iv3/2 b) (1/2)-iv3/2 c)(1/2)+iv3/2 d (-1/2)-iv3/2 ) 10. The equation of third degree with real coefficient whose two roots are 2 and i is a) x3-2x2+ x - 2 -0 b) x3-2x2- x - 2 = 0 c) x3- 8 = 0 d) x3 +8 = 0 Part B: