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LuckyWell [14K]
3 years ago
7

Simplify 3i(4-7i) help quick!

Mathematics
1 answer:
Maslowich3 years ago
4 0

i=\sqrt{-1}\to i^2=-1\\\\\text{Use distributive property:}\\\\3i(4-7i)=(3i)(4)-(3i)(7i)=12i-21i^2=12i-21(-1)\\\\=12i+21=\boxed{21+12i}

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