Incorrect solving of an equation with complex numbers
02-15-2016, 08:48 PM
Post: #1
 Oleksandr Junior Member Posts: 4 Joined: Sep 2015
Incorrect solving of an equation with complex numbers
Hi everyone! On the image, it seems that the first equation is solved incorrectly. The second one has a correct answer, though it is identical except I moved a term to the left side... And more interesting, if I change one coefficient, an equation is solved correctly in both cases (third and fourth equations). Is it a bug, or am I missing something?

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02-15-2016, 10:11 PM
Post: #2
 Nigel (UK) Senior Member Posts: 371 Joined: Dec 2013
RE: Incorrect solving of an equation with complex numbers
(02-15-2016 08:48 PM)Oleksandr Wrote:  Hi everyone! On the image, it seems that the first equation is solved incorrectly. The second one has a correct answer, though it is identical except I moved a term to the left side... And more interesting, if I change one coefficient, an equation is solved correctly in both cases (third and fourth equations). Is it a bug, or am I missing something?

It looks to me as though all 4 solutions are correct. The first two look different but if you multiply top and bottom of the first answer by 1+2i it becomes the second answer.

Nigel (UK)
02-16-2016, 06:24 AM (This post was last modified: 02-16-2016 06:29 AM by Oleksandr.)
Post: #3
 Oleksandr Junior Member Posts: 4 Joined: Sep 2015
RE: Incorrect solving of an equation with complex numbers
You are absolutely right, I did not notice that in the first answer i is in the denominator. I should never do any math after full workday in the evening. Thank you Nigel
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