2ײ-×-1=0 tolong bantu

2x² – x – 1 = 0
2x² – 2x + x – 1 = 0
(2x² – 2x) + (x – 1) = 0
2x (x – 1) + 1 (x – 1) = 0
(2x + 1) (x – 1) = 0
2x = -1 atau x = 1
x = -1/2