2
x   - 4x + 2 = 0  
 

if its 2x -4x +2=0
then -2x+2=0
         -2x=-2
            x= -2/-2
             x=1


BUT if this is a QE then
2x² - 4x + 2 = 0
then,
         2x² - 2x - 2x + 2 =0
      = 2x( x- 1 )  - 2 (x-1) = 0
         = (2x - 2 )  (x - 1 ) = 0
     = 2x=2
         x= 2/2 = 1                           and x- 1 = 0
                                                            x=1