Answer
$-5-12i$
Work Step by Step
Step 1: $(2-3i)(2-3i)$
Step 2: $2(2-3i)-3i(2-3i)$
Step 3: $4-6i-6i+9i^{2}$
Step 4: $4-12i +9(-1)$ as $i^{2}=-1$
$4-9-12i$
$-5-12i$
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