Bài 2:
\(a,=3x\left(x-4y\right)\\ b,=\left(x-y\right)^2+3\left(x-y\right)=\left(x-y+3\right)\left(x-y\right)\\ c,=x^2+2x+3x+6=\left(x+2\right)\left(x+3\right)\)
Bài 3:
\(a,\Leftrightarrow5x\left(x-4\right)=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=4\end{matrix}\right.\\ b,\Leftrightarrow\left(x-1\right)\left(3x-1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{1}{3}\end{matrix}\right.\\ c,\Leftrightarrow x^3+8-x^3-x=0\\ \Leftrightarrow x=8\)
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