faktorisasikan: 1. x2 – 2x – 1 = 0 2. x2 – 2x – 5 = 0

1. x² - 2x - 1 = 0
   (x-1) (x-1)
2. x² - 2x - 5 = 0
  

itu kyknya gini soalnya:
1) x² - 2x +1 = 0
   (x - 1)(x - 1) = 0
2) x² - 4x - 5 = 0
   (x - 5)(x + 1) = 0