4. 3(7 i7) (7+ i7)

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Solution

Given expression is,

3( 7+i7 )+i( 7+i7 )

Simplify the above expression as,

3( 7+i7 )+i( 7+i7 )=21+21i+7i+7 i 2 =21+28i−7 =14+28i

Thus, in the form of a+ib , the expression can be written as 14+28i .

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