Answer
$40$
Work Step by Step
Using $(a+b)(a-b)=a^2-b^2$ or the product of the sum and difference of like terms, the expression $
(6+2i)(6-2i)
$ simplifies to
\begin{array}{l}
6^2-(2i)^2
\\=
36-4i^2
\\=
36-4(-1)
\\=
40
.\end{array}
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