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For real a and b, (a + ib)(a - ib) simplifies to
Aa^2 + 2iab
B2a + 2ib
Ca^2 + b^2
Da^2 - b^2
Answer & Solution
Correct answer: C. a^2 + b^2
The cross terms cancel and -i^2 b^2 becomes +b^2, giving a^2 + b^2.
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