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December 16th, 2012, 03:51 AM  #1 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Complex numbers
Help on this

December 16th, 2012, 05:29 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,935 Thanks: 2209 
Can you evaluate (a) the numerator of the first term, (b) the denominator of the first term, or (c) the second term?

December 16th, 2012, 08:11 AM  #3 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Complex numbers
I don't know how to do this..(

December 16th, 2012, 08:30 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,935 Thanks: 2209 
(a) Can you evaluate (1 + 2i)  (2  i)?

December 16th, 2012, 08:45 AM  #5 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Complex numbers
Yes, I get 3i1

December 16th, 2012, 01:03 PM  #6 
Global Moderator Joined: Dec 2006 Posts: 20,935 Thanks: 2209 
That is correct. (b) Can you evaluate (1 + 2i)²? (In doing so, simplify the result by using the fact that i² = 1.) (c) Bearing in mind that i² = 1, what is the value of i^2013 = (i^2012)i? 

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