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The product $(2 + 3i)(2 - 3i)$ equals:

A$4 - 9i$
B$-5$
C13
D$13i$
Answer & Solution
Correct answer: C. 13
We have (2+3i)(2−3i) = 2² − (3i)². That is (2+3i)(2−3i) = 4 − 9(−1). So (2+3i)(2−3i) = 13.
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