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Question

Express 2i3+i in the form a + ib


A

1 + i

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B

(1 - i)

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C

1 - i

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D

(1 + i)

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Solution

The correct option is B

(1 - i)


2i3+i = 2i3+i×3i3i
= (61)+i(32)9+1
= 55i10
= 12(1 - i)


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