Question

encontre o termo geral da P.A. abaixo A=(3,7,...)

Answer 1

$P.A\ (3,7,...)\\\\r=\ \textgreater \ raz\~ao\\r=a_2-a_1\\a_1=\ \textgreater \ primeiro\ termo\\a_2=\ \textgreater \ \ segundo\ termo\\a_{n}=\ \textgreater \ termo\ geral\\\\a_{n}=a_1+(n-1)\cdot{r}\\a_{n}=3+(n-1)\cdot4\\a_n=3+4n-4\\a_n=4n-1$