Integraal van $$$- z_{2} \left(3 z - 3\right) + 4$$$ met betrekking tot $$$z$$$

Bepaal $$$\int \left(- z_{2} \left(3 z - 3\right) + 4\right)\, dz$$$.

Integreer termgewijs:

$${\color{red}{\int{\left(- z_{2} \left(3 z - 3\right) + 4\right)d z}}} = {\color{red}{\left(\int{4 d z} - \int{z_{2} \left(3 z - 3\right) d z}\right)}}$$

Pas de constantenregel $$$\int c\, dz = c z$$$ toe met $$$c=4$$$:

$$- \int{z_{2} \left(3 z - 3\right) d z} + {\color{red}{\int{4 d z}}} = - \int{z_{2} \left(3 z - 3\right) d z} + {\color{red}{\left(4 z\right)}}$$

Vereenvoudig de integraand:

$$4 z - {\color{red}{\int{z_{2} \left(3 z - 3\right) d z}}} = 4 z - {\color{red}{\int{3 z_{2} \left(z - 1\right) d z}}}$$

Pas de constante-veelvoudregel $$$\int c f{\left(z \right)}\, dz = c \int f{\left(z \right)}\, dz$$$ toe met $$$c=3 z_{2}$$$ en $$$f{\left(z \right)} = z - 1$$$:

$$4 z - {\color{red}{\int{3 z_{2} \left(z - 1\right) d z}}} = 4 z - {\color{red}{\left(3 z_{2} \int{\left(z - 1\right)d z}\right)}}$$

Integreer termgewijs:

$$4 z - 3 z_{2} {\color{red}{\int{\left(z - 1\right)d z}}} = 4 z - 3 z_{2} {\color{red}{\left(- \int{1 d z} + \int{z d z}\right)}}$$

Pas de constantenregel $$$\int c\, dz = c z$$$ toe met $$$c=1$$$:

$$4 z - 3 z_{2} \left(\int{z d z} - {\color{red}{\int{1 d z}}}\right) = 4 z - 3 z_{2} \left(\int{z d z} - {\color{red}{z}}\right)$$

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

$$4 z - 3 z_{2} \left(- z + {\color{red}{\int{z d z}}}\right)=4 z - 3 z_{2} \left(- z + {\color{red}{\frac{z^{1 + 1}}{1 + 1}}}\right)=4 z - 3 z_{2} \left(- z + {\color{red}{\left(\frac{z^{2}}{2}\right)}}\right)$$

Dus,

$$\int{\left(- z_{2} \left(3 z - 3\right) + 4\right)d z} = 4 z - 3 z_{2} \left(\frac{z^{2}}{2} - z\right)$$

Vereenvoudig:

$$\int{\left(- z_{2} \left(3 z - 3\right) + 4\right)d z} = \frac{z \left(- 3 z_{2} \left(z - 2\right) + 8\right)}{2}$$

Voeg de integratieconstante toe:

$$\int{\left(- z_{2} \left(3 z - 3\right) + 4\right)d z} = \frac{z \left(- 3 z_{2} \left(z - 2\right) + 8\right)}{2}+C$$

$$$\int \left(- z_{2} \left(3 z - 3\right) + 4\right)\, dz = \frac{z \left(- 3 z_{2} \left(z - 2\right) + 8\right)}{2} + C$$$A