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

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

User Aji
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i=√(-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}

User Ibrahim Ali
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