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

User Dasi
by
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2 Answers

2 votes
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
User Nitika Chopra
by
6.7k points
0 votes
standard form is a + bi
Combine like terms
5 + 17i
User Peter Rincker
by
5.7k points
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