Integral de $$$2 t - 4$$$

Encontre $$$\int \left(2 t - 4\right)\, dt$$$.

Integre termo a termo:

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

Aplique a regra da constante $$$\int c\, dt = c t$$$ usando $$$c=4$$$:

$$\int{2 t d t} - {\color{red}{\int{4 d t}}} = \int{2 t d t} - {\color{red}{\left(4 t\right)}}$$

Aplique a regra do múltiplo constante $$$\int c f{\left(t \right)}\, dt = c \int f{\left(t \right)}\, dt$$$ usando $$$c=2$$$ e $$$f{\left(t \right)} = t$$$:

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

Aplique a regra da potência $$$\int t^{n}\, dt = \frac{t^{n + 1}}{n + 1}$$$ $$$\left(n \neq -1 \right)$$$ com $$$n=1$$$:

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

Portanto,

$$\int{\left(2 t - 4\right)d t} = t^{2} - 4 t$$

Simplifique:

$$\int{\left(2 t - 4\right)d t} = t \left(t - 4\right)$$

Adicione a constante de integração:

$$\int{\left(2 t - 4\right)d t} = t \left(t - 4\right)+C$$

$$$\int \left(2 t - 4\right)\, dt = t \left(t - 4\right) + C$$$A