Complex numbers are theoretically interesting; they help us better understand the real numbers in some cases.They also have some very practical applications, including:
* Electrical circuits - in AC, things like resistance, current, and voltage acquire a phase angle, thus becoming complex numbers.
* Quantum mechanics - the probability amplitude is described with a complex number. As a result, complex numbers basically permeate all of quantum mechanics.
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electrical engineers and quantum mechanics use them.
Yes, many
I'm not sure about how to use complex numbers to do this, but I've posted a link to a pretty neat website about Synthetic Division.
using contraction and expansion
Complex numbers are a proper superset of real numbers. That is to say, real numbers are a proper subset of complex numbers.