Bài 2:
\(a,=\left(x-y\right)\left(3-5x\right)\\ b,=\left(3x-x+1\right)\left(3x+x-1\right)=\left(2x+1\right)\left(4x-1\right)\\ c,=3x\left(4x+2y-x^2\right)\\ d,=\left(x-y\right)\left(x+y\right)+\left(x-y\right)=\left(x+y+1\right)\left(x-y\right)\\ e,=\left(x-y\right)\left(b+5\right)\\ g,=x^2+2x+8x+16=\left(x+2\right)\left(x+8\right)\)
Bài 3:
\(a,\Leftrightarrow3x=-9\Leftrightarrow x=-3\\ b,\Leftrightarrow2x\left(x-3\right)=0\Leftrightarrow\left[{}\begin{matrix}x=2\\x=3\end{matrix}\right.\\ c,\Leftrightarrow\left(x-7\right)\left(x+7\right)=0\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-7\end{matrix}\right.\\ d,\Leftrightarrow x^2-x-6x+6=0\\ \Leftrightarrow\left(x-1\right)\left(x-6\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=6\end{matrix}\right.\)
