Khan/khan-exercises — Issue #12130: Dividing complex numbers - distributive property not working in solution
Author: KhanBugz
Created: 2012-01-25 22:01:49+00:00
State: open
Labels: chrome, win7, wrong-or-unclear

"Afterwards, the numerator is multiplied using the distributive property.

((−5)⋅(5+4i))/41= (-25+20i)/41"

Seems like this should be

(-25-20i)/41

[dividing_complex_numbers.html?seed=56&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/dividing_complex_numbers.html?seed=56&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/dividing_complex_numbers.html?seed=56&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5C%22-.63%5C%22%2C%5C%22-.49%5C%22%5D%22%2C191%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C5%5D%5D)

[["-.63","-.49"]]

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

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