Question

\(2x+3⋮x+1\)

Answer 1

\(2x+3⋮x+1\)

\(\Leftrightarrow2x+2+1⋮x+1\)

\(\Leftrightarrow2\left(x+1\right)+1⋮x+1\)

\(\Leftrightarrow1⋮x+1\)

\(\Leftrightarrow x+1\in\text{Ư}\left(1\right)=\left\{-1;1\right\}\)

\(\Leftrightarrow x\in\left\{-2;0\right\}\)

Answer 2

mk có cách làm tuyệt vời, xin giới thiệu để các bn giỏi toán tham khảo

2x +3 -2x-2 = 1

x+1(ư)1 = -1;1

x = -2;0