
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
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: 20,464 Thanks: 2038 
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: 20,464 Thanks: 2038 
(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: 20,464 Thanks: 2038 
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? 

Tags 
complex, numbers 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Can complex numbers (and properties of complex numbers) be..  jonas  Complex Analysis  2  October 13th, 2014 03:03 PM 
Complex numbers;  Miran977  Algebra  14  December 16th, 2012 02:58 AM 
0 in complex numbers  chocolate  Algebra  13  June 30th, 2012 01:35 AM 
Complex complex numbers  Tutu  Algebra  11  June 26th, 2012 01:36 PM 
Complex numbers help  jakeward123  Complex Analysis  9  February 8th, 2011 01:49 PM 