Question

30 DE PUNCTE + CORONITA

Answer 1

4n + 7 > n +1 
3n + 7 > 1
3n > 1 - 7
3n > -6
n> -6 : 3
n> -2

Answer 2

$\frac{4n+7}{n+1} \in N=\ \textgreater \ \\ n+1|4n+7 \\ n+1|n+1 |.4 \\ n+1|4n+7 \\ n+1|4n+4 \\ n+1|4n+7-4n-4 \\ n+1|3 \\ n+1 \in \{1,3\} \\ n \in \{0,2\}$