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A real-coefficient polynomial has 2 + 3i as a root. Which must also be a root?
A-2 + 3i
B-2 - 3i
C3 + 2i
D2 - 3i
Answer & Solution
Correct answer: D. 2 - 3i
Non-real roots of real polynomials come in conjugate pairs, so 2 - 3i is also a root.
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