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02-01-2017
Mathematics

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Write (21 − 4i) − (16 + 7i) + 28i as a complex number in standard form.

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02-01-2017

standard form is a + bi
Combine like terms
5 + 17i

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02-01-2017

treat i as a placeholder
get into standard form (a+bi)

distribute stuf and move
21-4i-16-7i+28i
21-16-4i-7i+28i
5+17i

Answer Link

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