Réponses

Meilleure réponse !
2013-01-03T14:47:44+01:00

si on ajoute 10, (x²+10)
(x+10)² = (x²+20x+100)
equation a resoudre
x²+1000 = x²+20x+100
x²-x²-20x = -1000+100
-20x = -900
x = 45