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

Mathematics

1 answer:

zheka24 [161]2 years ago

5 0

Assuming "i" is an imaginary unit:
$(-7i)(2+i)+(2i)(-7i)=\\
-14i+7+14=\\
21-14i$

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