Bài 2:
a: =>6 chia hết cho x
\(\Leftrightarrow x\in\left\{1;-1;2;-2;3;-3;6;-6\right\}\)
b: =>x+1+8 chia hết cho x+1
=>8 chia hét cho x+1
\(\Leftrightarrow x+1\in\left\{1;-1;2;-2;4;-4;8;-8\right\}\)
hay \(x\in\left\{0;-2;1;-3;3;-5;7;-9\right\}\)
c: =>2x-2+3 chia hết cho x-1
=>3 chia hết cho x-1
\(\Leftrightarrow x-1\in\left\{1;-1;3;-3\right\}\)
hay \(x\in\left\{2;0;4;-2\right\}\)