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Express of the complex number in the for...

Express of the complex number in the form `a + i b`. `3(7 + i7) + i(7 + i7)`

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The correct Answer is:
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`3(7+i7)+i(7+i7)`
`" "=21+21i+7i+7i^(2)`
`" "=21+21i+7i-7`
`" "=14+28i`
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