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Question

If a=1+i, then a2 equals


A

1 - i

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B

2i

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C

(1 + i) (1 - i)

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D

i - 1

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Solution

The correct option is B

2i


a = 1 + i

On squaring both the sides, we get,

a2=(1+i)2 a2=1+i2+2i a2=11+2i ( i2=1) a2=2i


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