Evaluating a simple complex expression

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SUMMARY

The discussion focuses on evaluating the complex expression ℝ(3-7i)^4. Participants explore methods for simplifying the expression, particularly emphasizing the polar form approach and the challenges associated with calculating the angle using tan inverse. The consensus leans towards expanding the expression as the most straightforward method, suggesting to first expand (3-7i)^2 and then square the result for simplification.

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  • Understanding of complex numbers and their properties
  • Familiarity with polar coordinates and conversion techniques
  • Knowledge of trigonometric functions, specifically tangent
  • Experience with algebraic expansion of binomials
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NewtonianAlch
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Homework Statement



ℝ(3-7i)^4

Is this asking for just the real part of this complex expression? I suppose I could go about expanding the whole thing out, but is there a more convenient method? We've learned a few methods, such as expressing it in polar form and such. But here the angle would be tan inverse of (-7/3) which renders it to some -66.80140949...

which makes it pretty hard to express in nice Pi angles.
 
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I think expanding is the simplest. First, expand (3-7i)^2 and simplify, then square again.

ehild
 

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