Question
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\( \int_{1}^{3}\left(12 x^{2}+2\right) d x \) Respuesta:

Ask by Ruiz West. in Colombia
Mar 09,2025

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Tutor-Verified Answer

Answer

El valor de la integral es 108.

Solution

Dado el integral \[ \int_{1}^{3}\left(12x^{2}+2\right)dx, \] primero encontramos la antiderivada de \(12x^2+2\). 1. La integral de \(12x^2\) es: \[ \int 12x^{2} dx = 12 \cdot \frac{x^{3}}{3} = 4x^{3}. \] 2. La integral de \(2\) es: \[ \int 2\, dx = 2x. \] Por lo tanto, la antiderivada es: \[ F(x)=4x^{3}+2x. \] Aplicamos el teorema fundamental del cálculo evaluando \(F(x)\) en los límites: \[ \int_{1}^{3}\left(12x^{2}+2\right)dx=F(3)-F(1). \] Evaluamos en \(x=3\): \[ F(3)=4(3)^{3}+2(3)=4\cdot27+6=108+6=114. \] Evaluamos en \(x=1\): \[ F(1)=4(1)^{3}+2(1)=4+2=6. \] Finalmente, el resultado del integral es: \[ 114-6=108. \] La respuesta es: \[ 108. \]

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Bonus Knowledge

Para resolver la integral \( \int_{1}^{3}\left(12 x^{2}+2\right) d x \), primero encontramos la primitiva de la función. La primitiva de \( 12 x^{2} \) es \( 4 x^{3} \) y la primitiva de \( 2 \) es \( 2x \). Por lo tanto, la primitiva total es \( 4 x^{3} + 2x \). Evaluamos en los límites de integración: \[ \left[ 4(3)^{3} + 2(3) \right] - \left[ 4(1)^{3} + 2(1) \right] = \left[ 4(27) + 6 \right] - \left[ 4 + 2 \right] = (108 + 6) - (4 + 2) = 114 - 6 = 108. \] Por lo tanto, el resultado de la integral es \( 108 \).

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