1.

Express in form of a+ib3(7+7i)+i(7+7i)​

Answer» ONG>Answer:

Given, 3(7+7i)+i(7+i7)

=21+21i+7i+7i

2

=21+28i+7×(−1),[∵i

2

=−1]

=14+28i=a+ib,

where a=14,b=28



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