Answer
$52$
Work Step by Step
Step 1: $(6-4i)(6+4i)$
Step 2: $6(6+4i)-4i(6+4i)$
Step 3: $36+24i-24i-16i^{2}$
Step 4: $36-16(-1)$
Step 5: $36+16$
Step 6: $52$
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