math1818
math1818
21-08-2017
Mathematics
contestada
7-4i divided by
2+i
how to solve it?
Respuesta :
Ilyes39
Ilyes39
22-08-2017
[tex] \frac{7-4i}{2+i} =\frac{(7-4i)(2-i)}{(2+i)(2-i)} = \frac{14-7i-8i+4i^2}{2^2 -i^2} \\\\ \frac{14-15i-4}{4+1} = \frac{10-15i}{5}= \frac{5(2-3i)}{5} \text{ because } i^2=-1.\\\\ =2-3i. [/tex]
Answer Link
VER TODAS LAS RESPUESTAS ( 21+ )
Otras preguntas
what is the simplest way to permanantly get rid of an unwanted file
Ashley has 500 songs in his music player. Every week he adds 10 songs to his collection. How many songs will he have in his music player after 20 weeks?
Which statement about Sen. Joseph McCarthy is true? A. He was a decorated hero who shot down many enemy planes during World War II. B. His baseless accusatio
The Industrial Revolution has been described as a mixed blessing. Do you agree or disagree? Support your answer with text references.
why is the planning of activities with the medical office important for the MAA
During the European Enlightenment the democratic idea emerged that governments get their power from __________.
60/100 in simplest form
What Are Advantages Of Dictatorship?
Why are all the cheetahs on earth members of the same biological species? A. All cheetahs on earth have the same genetic makeup. B. All cheetahs on earth orig
I'm doing theoretical probobility. Can you help me with this problem. It says to write it is a fraction, decimal, and a percent. The question is: randomly drawi
