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

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asked Oct 18, 2015 39.7k views

2 votes

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

Mathematics
high-school

Mission asked

by Mission

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1 Answer

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Assuming "i" is an imaginary unit:

$(-7i)(2+i)+(2i)(-7i)=\\ -14i+7+14=\\ 21-14i$

Scls answered Oct 23, 2015

by Scls

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

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