resoudre: x²-20x+16=0
Mathématiques
superwoman12
Question
resoudre:
x²-20x+16=0
x²-20x+16=0
1 Réponse
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1. Réponse Anonyme
x²-20x+16 = 0
(x-10)²+84 = 0
(x-10-V84)(x-10+V84) = 0
x-10-V84 = 0
x= 10+V84
ou x = 10+2V21 ( car V84 =2V21)
= 2(5+V21)
x-10+V84 = 0
x =10-V84
= 10-2V21
= 2(5-V21)