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Zyle04
@Zyle04
April 2019
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Coucou,
Je coince sur un de mes exercice de Maths pour mon DM.
Voici la question:
Prouve que l'équation: (2x-9)²-1=0 a deux solutions: 4 et 5.
Avec explications svp!!!
Répondez vite s'il vous plaît, j'ai besoin d'aide.
Zyle04
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Commentaires (1)
(2x-9)²-1=0
= a²-b² qu'on factorise (a-b)(a+b)
(2x-9-1)(2x-9+1) = 0
(2x-10)(2x-8) = 0
2x-10 = 0
2x =10
x =5
2x-8 =0
2x =8
x =4
2 votes
Thanks 1
Zyle04
Vraiment merci pour votre réponse !!!!
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= a²-b² qu'on factorise (a-b)(a+b)
(2x-9-1)(2x-9+1) = 0
(2x-10)(2x-8) = 0
2x-10 = 0
2x =10
x =5
2x-8 =0
2x =8
x =4