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December 16th, 2012, 02:35 AM  #11 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Complex numbers;
Not quite. Your 2nd and 3rd lines should be: = 2i(2i)i+22i = 4i^2 i +22i So what do you wind up with? 
December 16th, 2012, 02:39 AM  #12 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Complex numbers;
This: 26i

December 16th, 2012, 02:48 AM  #13 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Complex numbers;
Yes, that's correct. Your textbook may write the result as .

December 16th, 2012, 02:53 AM  #14 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Complex numbers
My text book has written the answer as 0 (zero); maybe them have made mistakes..

December 16th, 2012, 02:58 AM  #15 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Complex numbers
Presumably, as 0 is not the result.


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