What is the value of \(2^x + 2^{-x}?\)

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What is the value of \(2^x + 2^{-x}?\)

by Vincen » Thu Sep 09, 2021 6:34 am

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What is the value of \(2^x + 2^{-x}?\)

(1) \(x < 0\)
(2) \(4^x + 4^{-x} = 23\)

Answer: B

Source: Official Guide