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0∫−1 (4⋅x+12)⋅e2⋅xdx

Question

0∫−1 (4⋅x+12)⋅e2⋅xdx

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Solution

Claro, vamos a resolver la integral paso a paso.

La integral que tenemos es:

10(4x+12)e2xdx \int_{-1}^{0} (4x + 12) e^{2x} \, dx

Para resolver esta integral, podemos usar la técnica de integración por partes. Recordemos que la fórmula de integración por partes es:

udv=uvvdu \int u \, dv = uv - \int v \, du

Primero, identificamos u u y dv dv :

u=4x+12 u = 4x + 12 dv=e2xdx dv = e^{2x} \, dx

Ahora, derivamos u u y encontramos la integral de dv dv :

du=4dx du = 4 \, dx v=12e2x v = \frac{1}{2} e^{2x}

Aplicamos la fórmula de integración por partes:

10(4x+12)e2xdx=(4x+12)12e2x101012e2x4dx \int_{-1}^{0} (4x + 12) e^{2x} \, dx = \left. (4x + 12) \cdot \frac{1}{2} e^{2x} \right|_{-1}^{0} - \int_{-1}^{0} \frac{1}{2} e^{2x} \cdot 4 \, dx

Simplificamos:

=(4x+12)12e2x10210e2xdx = \left. (4x + 12) \cdot \frac{1}{2} e^{2x} \right|_{-1}^{0} - 2 \int_{-1}^{0} e^{2x} \, dx

Evaluamos la primera parte en los límites de integración:

(4x+12)12e2x10=[(4(0)+12)12e2(0)][(4(1)+12)12e2(1)] \left. (4x + 12) \cdot \frac{1}{2} e^{2x} \right|_{-1}^{0} = \left[ (4(0) + 12) \cdot \frac{1}{2} e^{2(0)} \right] - \left[ (4(-1) + 12) \cdot \frac{1}{2} e^{2(-1)} \right]

=[1212e0][(4(1)+12)12e2] = \left[ 12 \cdot \frac{1}{2} e^{0} \right] - \left[ (4(-1) + 12) \cdot \frac{1}{2} e^{-2} \right]

=6[(124)12e2] = 6 - \left[ (12 - 4) \cdot \frac{1}{2} e^{-2} \right]

=6[812e2] = 6 - \left[ 8 \cdot \frac{1}{2} e^{-2} \right]

=64e2 = 6 - 4e^{-2}

Ahora, evaluamos la segunda parte de la integral:

210e2xdx 2 \int_{-1}^{0} e^{2x} \, dx

Para esto, integramos e2x e^{2x} :

e2xdx=12e2x \int e^{2x} \, dx = \frac{1}{2} e^{2x}

Entonces:

210e2xdx=212e2x10 2 \int_{-1}^{0} e^{2x} \, dx = 2 \left. \frac{1}{2} e^{2x} \right|_{-1}^{0}

=e2x10 = \left. e^{2x} \right|_{-1}^{0}

Evaluamos en los límites de integración:

=e2(0)e2(1) = e^{2(0)} - e^{2(-1)}

=e0e2 = e^{0} - e^{-2}

=1e2 = 1 - e^{-2}

Finalmente, combinamos ambas partes:

64e2(1e2) 6 - 4e^{-2} - (1 - e^{-2})

=64e21+e2 = 6 - 4e^{-2} - 1 + e^{-2}

=53e2 = 5 - 3e^{-2}

Por lo tanto, el valor de la integral es:

53e2 \boxed{5 - 3e^{-2}}

This problem has been solved

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