Question
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\( \frac{1}{x^{2}+1}=3 \), entonces \( \frac{1}{x^{2}+5}= \)

Ask by Schneider Black. in Mexico
Mar 11,2025

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Tutor-Verified Answer

Answer

\[ \frac{1}{x^{2}+5} = \frac{3}{13} \]

Solution

Consideremos primero la ecuación dada: \[ \frac{1}{x^2+1} = 3 \] 1. Despejamos \( x^2 \). Tomamos el recíproco en ambos lados: \[ x^2+1 = \frac{1}{3} \] 2. Restamos 1 a ambos lados para aislar \( x^2 \): \[ x^2 = \frac{1}{3} - 1 = \frac{1-3}{3} = -\frac{2}{3} \] 3. Ahora evaluamos la expresión que se nos pide, \(\frac{1}{x^2+5}\). Sustituimos el valor hallado para \( x^2 \): \[ x^2+5 = -\frac{2}{3} + 5 = 5 - \frac{2}{3} \] 4. Convertimos 5 a una fracción con denominador 3: \[ 5 = \frac{15}{3} \] Entonces: \[ x^2+5 = \frac{15}{3} - \frac{2}{3} = \frac{13}{3} \] 5. Finalmente, calculamos \(\frac{1}{x^2+5}\): \[ \frac{1}{x^2+5} = \frac{1}{\frac{13}{3}} = \frac{3}{13} \] Por lo tanto, el resultado es: \[ \frac{1}{x^2+5} = \frac{3}{13} \]

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Primero resolvemos la ecuación \( \frac{1}{x^{2}+1}=3 \). Multiplicamos ambos lados por \( x^{2}+1 \) para despejar \( x^{2} \): \[ 1 = 3(x^{2}+1) \] \[ 1 = 3x^{2} + 3 \] \[ 3x^{2} = 1 - 3 \] \[ 3x^{2} = -2 \] \[ x^{2} = -\frac{2}{3} \] Sin embargo, como \( x^{2} \) no puede ser negativo, no hay soluciones reales para \( x \). Ahora, para \( \frac{1}{x^{2}+5} \), dado que \( x^{2} \) no es real, esta expresión no tendrá resultados reales válidos. De hecho, \( x^{2}+5 \) será siempre un número positivo, así que su inversión no se puede evaluar en el contexto de números reales.

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