Integraal van $$$b^{x - 1}$$$ met betrekking tot $$$x$$$

Bepaal $$$\int b^{x - 1}\, dx$$$.

Zij $$$u=x - 1$$$.

Dan $$$du=\left(x - 1\right)^{\prime }dx = 1 dx$$$ (de stappen zijn te zien »), en dan geldt dat $$$dx = du$$$.

Dus,

$${\color{red}{\int{b^{x - 1} d x}}} = {\color{red}{\int{b^{u} d u}}}$$

Apply the exponential rule $$$\int{a^{u} d u} = \frac{a^{u}}{\ln{\left(a \right)}}$$$ with $$$a=b$$$:

$${\color{red}{\int{b^{u} d u}}} = {\color{red}{\frac{b^{u}}{\ln{\left(b \right)}}}}$$

We herinneren eraan dat $$$u=x - 1$$$:

$$\frac{b^{{\color{red}{u}}}}{\ln{\left(b \right)}} = \frac{b^{{\color{red}{\left(x - 1\right)}}}}{\ln{\left(b \right)}}$$

Dus,

$$\int{b^{x - 1} d x} = \frac{b^{x - 1}}{\ln{\left(b \right)}}$$

Voeg de integratieconstante toe:

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

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