ແກ້ a_{1}(a_{1}-x)(a_{2}-x)=0

$$a _ { 1 } ( a _ { 1 } - x ) ( a _ { 2 } - x ) = 0$$

ແກ້ສຳລັບ a_1 (complex solution)

$$\left\{\begin{matrix}\\a_{1}=x\text{; }a_{1}=0\text{, }&\text{unconditionally}\\a_{1}\in \mathrm{C}\text{, }&x=a_{2}\end{matrix}\right,$$

ແກ້ສຳລັບ a_2 (complex solution)

$$\left\{\begin{matrix}\\a_{2}=x\text{, }&\text{unconditionally}\\a_{2}\in \mathrm{C}\text{, }&a_{1}=x\text{ or }a_{1}=0\end{matrix}\right,$$

ແກ້ສຳລັບ a_1

$$\left\{\begin{matrix}\\a_{1}=x\text{; }a_{1}=0\text{, }&\text{unconditionally}\\a_{1}\in \mathrm{R}\text{, }&x=a_{2}\end{matrix}\right,$$

ແກ້ສຳລັບ a_2

$$\left\{\begin{matrix}\\a_{2}=x\text{, }&\text{unconditionally}\\a_{2}\in \mathrm{R}\text{, }&a_{1}=x\text{ or }a_{1}=0\end{matrix}\right,$$