For what values is the expression always real?

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SUMMARY

The discussion centers on determining the conditions under which the expression \( a_2 \overline{\beta} + a_3 \beta \) remains real for all complex values of \( \beta \) constrained by \( |\beta| \le 1 \). It concludes that specific values for \( a_2 \) and \( a_3 \) must be established to ensure the expression is always real. The participants emphasize the need for further exploration of the relationship between the coefficients and the properties of complex numbers.

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Homework Statement


I have the expression ##a_2 \overline{\beta} + a_3 \beta## involving complex variables, where ##|\beta| \le 1##. I was wondering, is it possible to determine for what ##a_2## and ##a_3## the expression is always real, for every ##\beta## satisfying ##|\beta| \le 1##; or is there insufficient information?

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