freyaenriquez freyaenriquez

07-06-2014
Mathematics

Answered

Even if I have use bidmas I'm still confuse with this equation
(-7i)(2+i)+(2i)(-7i)

Answer :

konrad509 konrad509

07-06-2014

Assuming "i" is an imaginary unit:
[tex] (-7i)(2+i)+(2i)(-7i)=\\ -14i+7+14=\\ 21-14i[/tex]

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