Bài 2:
a: Ta có: \(x\left(x+3\right)=6x+18\)
\(\Leftrightarrow\left(x+3\right)\left(x-6\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-3\\x=6\end{matrix}\right.\)
b: Ta có: \(x^2\left(2x+1\right)-x\left(2x+1\right)=0\)
\(\Leftrightarrow x\left(2x+1\right)\left(x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-\dfrac{1}{2}\\x=1\end{matrix}\right.\)
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