-x²+2x-1 = 0
→ a = -1; b = 2; c = -1
→ determinant/discriminant = b²-4ac
determinant = (2)²-4*(-1)*(-1)
determinant = 4-4 = 0
Le determinant est nulle, donc on va chercher 1 solution.
soit x la solution unique
x = -b/2a = -2/(2*-1) = -2/-2 = 1
La solution de l’équation est 1.
Vérification:
-(1)²+2*1-1 = -1+2-1 = 0
