Integral de $$$\frac{- 2 x^{2} + 5 x - 2}{\left(x - 1\right)^{2}}$$$

Halla $$$\int \frac{- 2 x^{2} + 5 x - 2}{\left(x - 1\right)^{2}}\, dx$$$.

Como el grado del numerador no es menor que el grado del denominador, realiza la división larga de polinomios (los pasos pueden verse »):

$${\color{red}{\int{\frac{- 2 x^{2} + 5 x - 2}{\left(x - 1\right)^{2}} d x}}} = {\color{red}{\int{\left(\frac{x}{\left(x - 1\right)^{2}} - 2\right)d x}}}$$

Integra término a término:

$${\color{red}{\int{\left(\frac{x}{\left(x - 1\right)^{2}} - 2\right)d x}}} = {\color{red}{\left(- \int{2 d x} + \int{\frac{x}{\left(x - 1\right)^{2}} d x}\right)}}$$

Aplica la regla de la constante $$$\int c\, dx = c x$$$ con $$$c=2$$$:

$$\int{\frac{x}{\left(x - 1\right)^{2}} d x} - {\color{red}{\int{2 d x}}} = \int{\frac{x}{\left(x - 1\right)^{2}} d x} - {\color{red}{\left(2 x\right)}}$$

Reescribe el numerador del integrando como $$$x=x - 1+1$$$ y descompón la fracción:

$$- 2 x + {\color{red}{\int{\frac{x}{\left(x - 1\right)^{2}} d x}}} = - 2 x + {\color{red}{\int{\left(\frac{1}{x - 1} + \frac{1}{\left(x - 1\right)^{2}}\right)d x}}}$$

Integra término a término:

$$- 2 x + {\color{red}{\int{\left(\frac{1}{x - 1} + \frac{1}{\left(x - 1\right)^{2}}\right)d x}}} = - 2 x + {\color{red}{\left(\int{\frac{1}{\left(x - 1\right)^{2}} d x} + \int{\frac{1}{x - 1} d x}\right)}}$$

Sea $$$u=x - 1$$$.

Entonces $$$du=\left(x - 1\right)^{\prime }dx = 1 dx$$$ (los pasos pueden verse »), y obtenemos que $$$dx = du$$$.

Entonces,

$$- 2 x + \int{\frac{1}{\left(x - 1\right)^{2}} d x} + {\color{red}{\int{\frac{1}{x - 1} d x}}} = - 2 x + \int{\frac{1}{\left(x - 1\right)^{2}} d x} + {\color{red}{\int{\frac{1}{u} d u}}}$$

La integral de $$$\frac{1}{u}$$$ es $$$\int{\frac{1}{u} d u} = \ln{\left(\left|{u}\right| \right)}$$$:

$$- 2 x + \int{\frac{1}{\left(x - 1\right)^{2}} d x} + {\color{red}{\int{\frac{1}{u} d u}}} = - 2 x + \int{\frac{1}{\left(x - 1\right)^{2}} d x} + {\color{red}{\ln{\left(\left|{u}\right| \right)}}}$$

Recordemos que $$$u=x - 1$$$:

$$- 2 x + \ln{\left(\left|{{\color{red}{u}}}\right| \right)} + \int{\frac{1}{\left(x - 1\right)^{2}} d x} = - 2 x + \ln{\left(\left|{{\color{red}{\left(x - 1\right)}}}\right| \right)} + \int{\frac{1}{\left(x - 1\right)^{2}} d x}$$

Sea $$$u=x - 1$$$.

Entonces $$$du=\left(x - 1\right)^{\prime }dx = 1 dx$$$ (los pasos pueden verse »), y obtenemos que $$$dx = du$$$.

La integral puede reescribirse como

$$- 2 x + \ln{\left(\left|{x - 1}\right| \right)} + {\color{red}{\int{\frac{1}{\left(x - 1\right)^{2}} d x}}} = - 2 x + \ln{\left(\left|{x - 1}\right| \right)} + {\color{red}{\int{\frac{1}{u^{2}} d u}}}$$

Aplica la regla de la potencia $$$\int u^{n}\, du = \frac{u^{n + 1}}{n + 1}$$$ $$$\left(n \neq -1 \right)$$$ con $$$n=-2$$$:

$$- 2 x + \ln{\left(\left|{x - 1}\right| \right)} + {\color{red}{\int{\frac{1}{u^{2}} d u}}}=- 2 x + \ln{\left(\left|{x - 1}\right| \right)} + {\color{red}{\int{u^{-2} d u}}}=- 2 x + \ln{\left(\left|{x - 1}\right| \right)} + {\color{red}{\frac{u^{-2 + 1}}{-2 + 1}}}=- 2 x + \ln{\left(\left|{x - 1}\right| \right)} + {\color{red}{\left(- u^{-1}\right)}}=- 2 x + \ln{\left(\left|{x - 1}\right| \right)} + {\color{red}{\left(- \frac{1}{u}\right)}}$$

Recordemos que $$$u=x - 1$$$:

$$- 2 x + \ln{\left(\left|{x - 1}\right| \right)} - {\color{red}{u}}^{-1} = - 2 x + \ln{\left(\left|{x - 1}\right| \right)} - {\color{red}{\left(x - 1\right)}}^{-1}$$

Por lo tanto,

$$\int{\frac{- 2 x^{2} + 5 x - 2}{\left(x - 1\right)^{2}} d x} = - 2 x + \ln{\left(\left|{x - 1}\right| \right)} - \frac{1}{x - 1}$$

Simplificar:

$$\int{\frac{- 2 x^{2} + 5 x - 2}{\left(x - 1\right)^{2}} d x} = \frac{\left(- 2 x + \ln{\left(\left|{x - 1}\right| \right)}\right) \left(x - 1\right) - 1}{x - 1}$$

Añade la constante de integración:

$$\int{\frac{- 2 x^{2} + 5 x - 2}{\left(x - 1\right)^{2}} d x} = \frac{\left(- 2 x + \ln{\left(\left|{x - 1}\right| \right)}\right) \left(x - 1\right) - 1}{x - 1}+C$$

$$$\int \frac{- 2 x^{2} + 5 x - 2}{\left(x - 1\right)^{2}}\, dx = \frac{\left(- 2 x + \ln\left(\left|{x - 1}\right|\right)\right) \left(x - 1\right) - 1}{x - 1} + C$$$A