áp dụng định lý Bơzon
Nãy nhầm :))
\(f\left(x\right)⋮\left(x-2\right)\left(x-3\right)\)
\(\Leftrightarrow\left\{{}\begin{matrix}f\left(2\right)=4+2a-b=0\\f\left(3\right)=9+3a-b=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}2a-b=-4\\3a-b=-9\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=-5\\2a-b=-4\end{matrix}\right.\)
\(\Leftrightarrow a=-5;b=-6\)