Integraal van $$$\frac{x^{2} - x}{x}$$$

Bepaal $$$\int \frac{x^{2} - x}{x}\, dx$$$.

Expand the expression:

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

Integreer termgewijs:

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

Pas de constantenregel $$$\int c\, dx = c x$$$ toe met $$$c=1$$$:

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

Pas de machtsregel $$$\int x^{n}\, dx = \frac{x^{n + 1}}{n + 1}$$$ $$$\left(n \neq -1 \right)$$$ toe met $$$n=1$$$:

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

Dus,

$$\int{\frac{x^{2} - x}{x} d x} = \frac{x^{2}}{2} - x$$

Vereenvoudig:

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

Voeg de integratieconstante toe:

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

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