Integraal van $$$\frac{x^{2}}{3}$$$

Bepaal $$$\int \frac{x^{2}}{3}\, dx$$$.

Pas de constante-veelvoudregel $$$\int c f{\left(x \right)}\, dx = c \int f{\left(x \right)}\, dx$$$ toe met $$$c=\frac{1}{3}$$$ en $$$f{\left(x \right)} = x^{2}$$$:

$${\color{red}{\int{\frac{x^{2}}{3} d x}}} = {\color{red}{\left(\frac{\int{x^{2} d x}}{3}\right)}}$$

Pas de machtsregel $$$\int x^{n}\, dx = \frac{x^{n + 1}}{n + 1}$$$ $$$\left(n \neq -1 \right)$$$ toe met $$$n=2$$$:

$$\frac{{\color{red}{\int{x^{2} d x}}}}{3}=\frac{{\color{red}{\frac{x^{1 + 2}}{1 + 2}}}}{3}=\frac{{\color{red}{\left(\frac{x^{3}}{3}\right)}}}{3}$$

Dus,

$$\int{\frac{x^{2}}{3} d x} = \frac{x^{3}}{9}$$

Voeg de integratieconstante toe:

$$\int{\frac{x^{2}}{3} d x} = \frac{x^{3}}{9}+C$$

$$$\int \frac{x^{2}}{3}\, dx = \frac{x^{3}}{9} + C$$$A