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December 13th, 2012, 11:21 AM  #1 
Newbie Joined: Dec 2012 Posts: 1 Thanks: 0  modulus of complex numbers
Hi! I I'm having problems with the calculation of these two examples. (see attachment) Would you please help me? thanx in advance 
December 14th, 2012, 03:00 AM  #2 
Senior Member Joined: May 2011 Posts: 501 Thanks: 6  Re: modulus of complex numbers
For the first one, you are finding a closed form for Now, just use the closed form for the sum of the integers: and , then put it together. For the second one, I am having a difficult time reading the denominator in the middle term. Is that 3+2i?. If so, just reduce it down. You should get . What is the modulus of this?. 

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