[tex]x {}^{2} - 3x + 2 = 0[/tex]
[tex]x {}^{2} - x - 2x + 2 = 0[/tex]
[tex]x \times (x - 1) - 2(x - 1) = 0[/tex]
[tex](x - 1) \times (x - 2) = 0[/tex]
[tex]x - 1 = 0 \\ x - 2 = 0[/tex]
[tex]x1 = 1 \\ \\ x2 = 2[/tex]