(Sqrt(2)+i Sqrt(4))(Sqrt(2)-i Sqrt(4))

i need help with this equation for pre-cal. it jsut needs to be simplified,.
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1 Answer

Factor out Sqrt to give Sqrt[{2 + i(4)}{2 - i(4)}]

Multiply out Sqrt[4 - i(8) + i(8) - i²16]  =
 Combine   Sqrt(4 - i²16)  =

                     4Sqrt(1 - 4i²)
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