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December 15th, 2012, 11:35 PM  #11 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Help complex numbers
I dont know this step( can you help more?

December 15th, 2012, 11:39 PM  #12 
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: Help complex numbers Now, combine the numbers within the parentheses. 
December 16th, 2012, 12:00 AM  #13 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Help complex numbers
I get this: 6/5 12/5i 
December 16th, 2012, 12:14 AM  #14 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Help complex numbers
Are it right?

December 16th, 2012, 12:29 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: Help complex numbers
Yes, that's correct! 
December 16th, 2012, 12:37 AM  #16 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Help complex numbers
The answer on the book are : 6/5 * (1+2i) Maybe tha author have make mistakes. 
December 16th, 2012, 12:45 AM  #17 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Help complex numbers
Im not sure but on the text the answer is : 6/5 * (1+2i)

December 16th, 2012, 12:57 AM  #18 
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: Help complex numbers
That is equivalent to your answer, just factor 6/5 out. I am used to the result being given in the form a + bi.

December 16th, 2012, 01:01 AM  #19 
Newbie Joined: Dec 2012 Posts: 28 Thanks: 0  Re: Help complex numbers
So both of them are correct?

December 16th, 2012, 01:09 AM  #20 
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: Help complex numbers
Yes, they are just different ways to write the same thing. Observe that: 

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