Có A chia cho x - 2 dư 3 ; chia cho x + 2 dư - 5
\(\Leftrightarrow\left\{{}\begin{matrix}8+5.4+2a+b=3\\-8+5.4-2a+b=-5\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}2a+b=-25\\b-2a=-17\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}4a=-8\\2a+b=-25\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=-2\\b=-29\end{matrix}\right.\)
Vậy...
P/s : khum chắc :33