Answer
$89$
Work Step by Step
Step 1: $(8+5i)(8-5i)$
Step 2: $8(8-5i)+5i(8-5i)$
Step 3: $64-40i+40i-25i^{2}$
Step 4: $64-25i^{2}$
Step 5: $64-25(-1)$
Step 6: $64+25$
Step 7: $89$
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