b. Let z =213-2i. 1. Sketch z on the Argand plane. (1 mark) 11. Find the modulus and argument of z , and hence express z in polar form z = r (cos # + isin e) . (2 marks) 111. Using de Moivre's formula or otherwise, find z expressed in the form a + bi . (2 marks) c. Find all solutions to the equation W =4+431 =8 cos + isin 3 Give each solution in the form w=a+ bi correct to 3 decimal places