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December 13th, 2012, 11:21 AM   #1
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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
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December 14th, 2012, 03:00 AM   #2
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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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