Question

\(\left(x-2\right)^2.\left(x-9\right)=0\)

Answer 1

(x-2)\(^2\).(x-9)

<=>\(\left[{}\begin{matrix}\left(x-2\right)^2=0\\x-9=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=9\end{matrix}\right.\)

vậy S={2;9}