16√19 i is the correct answer.
[tex]\sqrt{-76}=2\sqrt{19 i}[/tex]
[tex]8*2\sqrt{19 i}[/tex]
You can also multiply by the numbers.
8*2=16
[tex]=16\sqrt{19 i}[/tex]
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Hope this helps! And thank you for posting your question at here on brainly, and have a great day. -Charlie