If $z_{1} = 2 + 3i$ and $z_{2} = 1 - i$, find $z_{1} z_{2}$.
A$-1 + 5i$
B$5 - i$
C$2 - 3i$
D$5 + i$
Answer & Solution
Correct answer: D. $5 + i$
$2 - 2i + 3i - 3i^{2} = 5 + i$.
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