Integraal van $$$- 2 x^{2} + \frac{x}{57}$$$

Bepaal $$$\int \left(- 2 x^{2} + \frac{x}{57}\right)\, dx$$$.

Integreer termgewijs:

$${\color{red}{\int{\left(- 2 x^{2} + \frac{x}{57}\right)d x}}} = {\color{red}{\left(\int{\frac{x}{57} d x} - \int{2 x^{2} d x}\right)}}$$

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

$$\int{\frac{x}{57} d x} - {\color{red}{\int{2 x^{2} d x}}} = \int{\frac{x}{57} d x} - {\color{red}{\left(2 \int{x^{2} d x}\right)}}$$

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

$$\int{\frac{x}{57} d x} - 2 {\color{red}{\int{x^{2} d x}}}=\int{\frac{x}{57} d x} - 2 {\color{red}{\frac{x^{1 + 2}}{1 + 2}}}=\int{\frac{x}{57} d x} - 2 {\color{red}{\left(\frac{x^{3}}{3}\right)}}$$

Pas de constante-veelvoudregel $$$\int c f{\left(x \right)}\, dx = c \int f{\left(x \right)}\, dx$$$ toe met $$$c=\frac{1}{57}$$$ en $$$f{\left(x \right)} = x$$$:

$$- \frac{2 x^{3}}{3} + {\color{red}{\int{\frac{x}{57} d x}}} = - \frac{2 x^{3}}{3} + {\color{red}{\left(\frac{\int{x d x}}{57}\right)}}$$

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

$$- \frac{2 x^{3}}{3} + \frac{{\color{red}{\int{x d x}}}}{57}=- \frac{2 x^{3}}{3} + \frac{{\color{red}{\frac{x^{1 + 1}}{1 + 1}}}}{57}=- \frac{2 x^{3}}{3} + \frac{{\color{red}{\left(\frac{x^{2}}{2}\right)}}}{57}$$

Dus,

$$\int{\left(- 2 x^{2} + \frac{x}{57}\right)d x} = - \frac{2 x^{3}}{3} + \frac{x^{2}}{114}$$

Vereenvoudig:

$$\int{\left(- 2 x^{2} + \frac{x}{57}\right)d x} = \frac{x^{2} \left(1 - 76 x\right)}{114}$$

Voeg de integratieconstante toe:

$$\int{\left(- 2 x^{2} + \frac{x}{57}\right)d x} = \frac{x^{2} \left(1 - 76 x\right)}{114}+C$$

$$$\int \left(- 2 x^{2} + \frac{x}{57}\right)\, dx = \frac{x^{2} \left(1 - 76 x\right)}{114} + C$$$A