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Si \( \int_{0}^{4} x^{2} d x=\frac{64}{3} \) Entonce el valor de en fracción \( (\mathrm{a} / \mathrm{b}) \) de \( \int_{-4}^{4} x^{2} d x \), es: Respuesta:

Ask by Reyes Little. in Colombia
Mar 09,2025

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Answer

La integral de \( x^{2} \) desde -4 hasta 4 es \( \frac{128}{3} \).

Solution

1. Se sabe que \( \int_{0}^{4} x^{2}\,dx = \frac{64}{3} \). 2. La función \( x^2 \) es una función par, por lo que se cumple que \[ \int_{-4}^{4} x^{2}\,dx = 2\int_{0}^{4} x^{2}\,dx. \] 3. Sustituyendo el valor dado: \[ \int_{-4}^{4} x^{2}\,dx = 2\left(\frac{64}{3}\right) = \frac{128}{3}. \] 4. Por lo tanto, la respuesta en fracción es \[ \frac{128}{3}. \]

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Para calcular \( \int_{-4}^{4} x^{2} d x \), consideramos la simetría de la función \( x^{2} \). Dado que \( x^{2} \) es par, podemos utilizar la propiedad de integrales de funciones pares: \[ \int_{-4}^{4} x^{2} d x = 2 \int_{0}^{4} x^{2} d x \] Sustituyendo el valor que ya tenemos: \[ \int_{-4}^{4} x^{2} d x = 2 \cdot \frac{64}{3} = \frac{128}{3} \] Por lo tanto, el valor en fracción de \( \int_{-4}^{4} x^{2} d x \) es \( \frac{128}{3} \), lo que implica que: \[ \mathrm{a} = 128 \text{, } \mathrm{b} = 3 \]

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