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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: 520 Math Focus: Calculus/ODEs Re: Complex numbers; Not quite. Your 2nd and 3rd lines should be: = 2i(2i)i+2-2i = 4i^2 i +2-2i 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: 2-6i
 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: 520 Math Focus: Calculus/ODEs Re: Complex numbers; Yes, that's correct. Your textbook may write the result as $2(1-3i)$.
 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: 520 Math Focus: Calculus/ODEs Re: Complex numbers Presumably, as 0 is not the result.

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