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Which of the following complex expressions is NOT simplified correctly?
A. (4+3i)+(-7-8i) = -3 - 5i
B. (2 + 3i)2 = -5
C. (5-2i)(2+4i) = 18 + 16i
D. (3 - 4i)(3 + 4i) = 25
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second one is not correct... the rest are all ok simplifications.
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