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Elisa94
@Elisa94
May 2019
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Bonjour,
Je suis en classe de troisième et je ne sais pas comment résoudre cette équation produit nul... : (x+2)²-9=0
Merci d'avance
Au revoir
Elisa
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Verified answer
Bonjour,
(x+2)²-9=0 = a²-b² = (a-b)(a+b)
1) on factorise
(x+2-3)(x+2+3) = 0
(x-1)(x+5) = 0
2) on résous
x-1 = 0
x = 1
x+5 =0
x = -5
1 votes
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Verified answer
Bonjour,(x+2)²-9=0 = a²-b² = (a-b)(a+b)
1) on factorise
(x+2-3)(x+2+3) = 0
(x-1)(x+5) = 0
2) on résous
x-1 = 0
x = 1
x+5 =0
x = -5