x²-x-6=0 kuadrat sempurna

Melengkapkan Kuadrat
x² - x - 6 = 0
x² - x = 6
x² - 2.x .1/2 + (1/2)² = 6 + (1/2)²
(x - 1/2)² = 25/4
x - 1/2 = ± √(25/4)
x - 1/2 = ± 5/2
x = 1/2 ± 5/2

x1 = 1/2 + 5/2 = 3
x2 = 1/2 - 5/2 = -2

HP = {-2 , 3}