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Ecuaciones logaritmicas, exponenciales y trigonométricas 295. Si \( x=\log _{2}\left[\log _{4}\left(\log _{8} 64\right)\right] \), determina el valor de la operación \( 4^{1+x}+2^{1-x} \) \( \begin{array}{llll}\text { A) } 2 & \text { B) } 5 & \text { C) } 8 & \text { D) } 10\end{array} \)

Ask by Li Pearson. in Mexico
Feb 04,2025

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El valor de la operación \( 4^{1+x} + 2^{1-x} \) es 5.

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The Deep Dive

Primero, resolvamos la parte de \( x=\log _{2}\left[\log _{4}\left(\log _{8} 64\right)\right] \). Sabemos que \( \log _{8} 64 = \log_{8}(8^2) = 2 \), así que tenemos \( x = \log_{2}[\log_{4}(2)] \). Luego, \( \log_{4}(2) = \frac{1}{2} \), y así \( x = \log_{2}\left(\frac{1}{2}\right) = -1 \). Con \( x = -1 \), calculamos \( 4^{1+x} + 2^{1-x} \): \[ 4^{1-1} + 2^{1 - (-1)} = 4^{0} + 2^{2} = 1 + 4 = 5. \] Entonces, el valor de la operación es 5, lo que nos lleva a la respuesta correcta: B) 5.

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