4x + 3 \(⋮\) x - 2
\(\Leftrightarrow\) 4(x - 2) + 8 + 3 \(⋮\) x - 2
\(\Leftrightarrow\) 11 \(⋮\) x - 2
\(\Leftrightarrow\) \(x-2\inƯ\left(11\right)=\left\{\pm1;\pm11\right\}\)
\(\Leftrightarrow x\in\left\{3;1;13;-9\right\}\)
(4.3)⋮(x-2)
4(x-2)+8+3⋮x-2
vì x-2⋮x-2
nên 8+3⋮x-2
hay 11⋮x-2
⇒x-2 ϵ Ư(11)
Ư(11)={1;-1;11;-11}
x-2 | 1 | -1 | 11 | -11 |
x | 3 | 1 | 13 | -9 |
⇒x∈{3;1;13;-9}