Question

Tìm n để:n^2+n+4 chia hết cho n+1

Answer 1

=>4 chia hết cho n+1

=>\(n+1\in\left\{1;-1;2;-2;4;-4\right\}\)

=>\(n\in\left\{0;-2;1;-3;3;-5\right\}\)