tìm x biết: 4x(x-3)- 2x + 6 = 0

* Hướng dẫn giải

$\begin{array}{l}4\mathrm{x}\left(\mathrm{x}-3\right)-2\mathrm{x}+6=0\\ 4\mathrm{x}\left(\mathrm{x}-3\right)-2\left(\mathrm{x}-3\right)=0\\ \left(\mathrm{x}-3\right)\left(4\mathrm{x}-2\right)=0\\ \Rightarrow \left[\begin{array}{l}\mathrm{x}-3=0\\ 4\mathrm{x}-2=0\end{array}\right.\Rightarrow \left[\begin{array}{l}\mathrm{x}=3\\ \mathrm{x}=\frac{1}{2}\end{array}\right.\end{array}$