Integraal van $$$\frac{4}{x^{8}}$$$

Bepaal $$$\int \frac{4}{x^{8}}\, dx$$$.

Pas de constante-veelvoudregel $$$\int c f{\left(x \right)}\, dx = c \int f{\left(x \right)}\, dx$$$ toe met $$$c=4$$$ en $$$f{\left(x \right)} = \frac{1}{x^{8}}$$$:

$${\color{red}{\int{\frac{4}{x^{8}} d x}}} = {\color{red}{\left(4 \int{\frac{1}{x^{8}} d x}\right)}}$$

Pas de machtsregel $$$\int x^{n}\, dx = \frac{x^{n + 1}}{n + 1}$$$ $$$\left(n \neq -1 \right)$$$ toe met $$$n=-8$$$:

$$4 {\color{red}{\int{\frac{1}{x^{8}} d x}}}=4 {\color{red}{\int{x^{-8} d x}}}=4 {\color{red}{\frac{x^{-8 + 1}}{-8 + 1}}}=4 {\color{red}{\left(- \frac{x^{-7}}{7}\right)}}=4 {\color{red}{\left(- \frac{1}{7 x^{7}}\right)}}$$

Dus,

$$\int{\frac{4}{x^{8}} d x} = - \frac{4}{7 x^{7}}$$

Voeg de integratieconstante toe:

$$\int{\frac{4}{x^{8}} d x} = - \frac{4}{7 x^{7}}+C$$

$$$\int \frac{4}{x^{8}}\, dx = - \frac{4}{7 x^{7}} + C$$$A