Réponses

2013-11-25T17:31:47+01:00
-3x²+18x+1=0
-3x²+18x +1 -1 =0-1
-3x²+18x = -1
-3x² + 3x * 6 = -1
-3x *x + 3x*6 = -1
x+6 = -1
x+6-6 = -1 -6
x= -7
Voila j'espère que c'est bon :$ Bisous ;)

2013-11-25T17:35:54+01:00
Bonsoir
-3x²+18x+1 = 0 
delta = (18)²-4(-3)(1)= 336
racine delta =Vdelta = V336 = 18.33
deux solutions
x ' = (-b-Vdelta) / 2a = (-b+Vdelta) / 2a = -0.055
x" =(-b-Vdelta)2a = 60.55