Answer
$18$
Work Step by Step
Step 1: $(\sqrt 2-4i)(\sqrt 2+4i)$
Step 2: $\sqrt 2(\sqrt 2+4i)-4i(\sqrt 2+4i)$
Step 3: $2+4i\sqrt 2-4i\sqrt 2-16i^{2}$
Step 4: $2-16(-1)$
Step 5: $2+16$
Step 6: $18$
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