Complex numbers

1. Apr 15, 2007

Anood

How can i find The imaginary part of (1-2i)^2-i.

This is what i have done so far:
(1-2i)^2 (1-2i)^-i

=(1-4i+4)(1-2i)^-i

2. Apr 15, 2007

neutrino

Use the polar form of 1-2i.