Question
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etermina el valor de " n " si: \( \mathrm{P}(7)=1 \) \[ P(x)=2 x^{2}+x n+1 \]

Ask by Cole Whittaker. in Peru
Jan 23,2025

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Answer

El valor de \( n \) es \( -14 \).

Solution

Para determinar el valor de \( n \) en la función \( P(x) = 2x^2 + xn + 1 \) dado que \( P(7) = 1 \), seguimos estos pasos: 1. **Sustituir \( x \) por 7 en la función \( P(x) \)**: \[ P(7) = 2(7^2) + 7n + 1 \] 2. **Calcular \( 7^2 \)**: \[ 7^2 = 49 \] 3. **Sustituir el valor de \( 7^2 \) en la ecuación**: \[ P(7) = 2(49) + 7n + 1 \] 4. **Calcular \( 2(49) \)**: \[ 2(49) = 98 \] 5. **Sustituir este valor en la ecuación**: \[ P(7) = 98 + 7n + 1 \] 6. **Sumar \( 98 + 1 \)**: \[ P(7) = 99 + 7n \] 7. **Igualar a 1, ya que \( P(7) = 1 \)**: \[ 99 + 7n = 1 \] 8. **Restar 99 de ambos lados**: \[ 7n = 1 - 99 \] \[ 7n = -98 \] 9. **Dividir ambos lados entre 7 para despejar \( n \)**: \[ n = \frac{-98}{7} \] 10. **Calcular el valor de \( n \)**: \[ n = -14 \] Por lo tanto, el valor de \( n \) es \( \boxed{-14} \).

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Para encontrar el valor de \( n \) dado que \( \mathrm{P}(7) = 1 \), primero sustituimos \( x \) por 7 en la función polinómica: \[ P(7) = 2(7^2) + 7n + 1 \] Calculamos \( 7^2 \): \[ P(7) = 2(49) + 7n + 1 = 98 + 7n + 1 \] Simplificamos: \[ P(7) = 99 + 7n \] Dado que sabemos que \( P(7) = 1 \), igualamos la expresión a 1: \[ 99 + 7n = 1 \] Restamos 99 de ambos lados: \[ 7n = 1 - 99 \] \[ 7n = -98 \] Dividimos ambos lados entre 7: \[ n = -\frac{98}{7} = -14 \] Por lo tanto, el valor de \( n \) es \( -14 \).

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