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Question

The value of (3+4i)(67i) is

A
46+3i
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B
18-28i
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C
46-3i
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D
18+28i
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Solution

The correct option is A 46+3i

(3+4i)(67i)=3×6+3×(7)i+4i×6+4i×(7)i=1821i+24i+28=46+3i


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