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Calcule el valor de la integral doble \( \int_{0}^{1} \int_{0}^{x}(2 x+3 y) d y d x \) O 1.16 2.23 1.89

Ask by Moreno Donnelly. in Mexico
Mar 10,2025

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Answer

El valor de la integral doble es \(1.16\).

Solution

1. Evaluamos la integral interna: \[ \int_{0}^{x}(2x+3y)\,dy = \int_{0}^{x}2x\,dy + \int_{0}^{x}3y\,dy. \] Como \(2x\) es constante respecto de \(y\), se tiene: \[ \int_{0}^{x}2x\,dy = 2x\int_{0}^{x}dy = 2x \cdot x = 2x^2. \] Y para el segundo término: \[ \int_{0}^{x}3y\,dy = 3\int_{0}^{x}y\,dy = 3 \cdot \frac{x^2}{2} = \frac{3x^2}{2}. \] Por lo tanto, \[ \int_{0}^{x}(2x+3y)\,dy = 2x^2 + \frac{3x^2}{2} = \frac{4x^2}{2} + \frac{3x^2}{2} = \frac{7x^2}{2}. \] 2. Evaluamos la integral externa: \[ \int_{0}^{1}\frac{7x^2}{2}\,dx = \frac{7}{2}\int_{0}^{1} x^2\,dx. \] Calculamos \(\displaystyle \int_{0}^{1} x^2\,dx\): \[ \int_{0}^{1} x^2\,dx = \left[\frac{x^3}{3}\right]_{0}^{1} = \frac{1}{3}. \] Por lo tanto, \[ \frac{7}{2}\int_{0}^{1} x^2\,dx = \frac{7}{2} \cdot \frac{1}{3} = \frac{7}{6} \approx 1.16. \] La respuesta correcta es \(1.16\).

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Para calcular la integral doble \( \int_{0}^{1} \int_{0}^{x}(2 x+3 y) d y d x \), primero evaluamos la integral interna. 1. Evaluamos \( \int_{0}^{x} (2x + 3y) \, dy \): \[ \int (2x + 3y) \, dy = 2xy + \frac{3y^2}{2} + C \] Evaluando de \(0\) a \(x\): \[ \left[ 2x(y) + \frac{3y^2}{2} \right]_{0}^{x} = 2x(x) + \frac{3(x^2)}{2} - (0) = 2x^2 + \frac{3x^2}{2} = \frac{4x^2}{2} + \frac{3x^2}{2} = \frac{7x^2}{2} \] 2. Ahora integramos esto respecto a \(x\): \[ \int_{0}^{1} \frac{7x^2}{2} \, dx = \frac{7}{2} \int_{0}^{1} x^2 \, dx = \frac{7}{2} \left[ \frac{x^3}{3} \right]_{0}^{1} = \frac{7}{2} \cdot \frac{1}{3} = \frac{7}{6} \] Por lo tanto, el valor de la integral doble es \( \frac{7}{6} \approx 1.17 \). Dado que esta no coincide exactamente con ninguna de las respuestas proporcionadas, pero se aproxima a 1.16, pienso que podrías optar por 1.16.

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