salah satu faktor dari 2xpangkat2-5x+2 adalah

2x^2 - 5x + 2 = 0 ........ Dibagi 2
x^2 - 5/2x + 1 = 0
x^2 - 5/2x = -1
x^2 - 5/2x + 25/16 = -1 + 25/16
(x - 5/2)^2 = -16/16 + 25/16
(x - 5/2)^2 = 9/16
x - 5/2 = akar 9/16
x - 5/2 = +- 3/4

x = 5/2 + 3/4
= 10/4 + 3/4
x = 13/4
x - 13/4 = 0

atau

x = 5/2 - 3/4
= 10/4 - 3/4
x = 7/4
x - 7/4 = 0

Sorry kalo salah :)