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If z = 1 + i, then z² equals

A2
B1 + 2i
C−2i
D2i
Answer & Solution
Correct answer: D. 2i
We have (1+i)² = 1 + 2i + i². That is (1+i)² = 1 + 2i − 1. So (1+i)² = 2i.
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