Gọi \(d=ƯC\left(2n+3;n^2+3n+2\right)\)
\(\Rightarrow2\left(n^2+3n+2\right)-n\left(2n^2+3\right)⋮d\)
\(\Rightarrow3n+4⋮d\)
\(\Rightarrow3\left(2n+3\right)-2\left(3n+4\right)⋮d\)
\(\Rightarrow1⋮d\Rightarrow d=1\)
Vậy \(2n+3\) và \(n^2+3n+2\) nguyên tố cùng nhau