Bonjour
Ce sont des équations produit nul
(2x + 6) (x - 5) = 0
2x + 6 = 0 ou x - 5 = 0
2x = - 6 x = 5
x = - 6/2 = - 3
S = (- 3 ; 5)
(5x + 7) (4x - 8) = 0
5x + 7 = 0 ou 4x - 8 = 0
5x = - 7 4x = 8
x = - 7/5 x = 8/4 = 2
S = (- 7/5 ; 2)
Réponse :
1. x1 = -3 ; x2 = 5
2. x1 = -1,4 ; x2 = 2
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Bonjour
Ce sont des équations produit nul
(2x + 6) (x - 5) = 0
2x + 6 = 0 ou x - 5 = 0
2x = - 6 x = 5
x = - 6/2 = - 3
S = (- 3 ; 5)
(5x + 7) (4x - 8) = 0
5x + 7 = 0 ou 4x - 8 = 0
5x = - 7 4x = 8
x = - 7/5 x = 8/4 = 2
S = (- 7/5 ; 2)
Réponse :
1. x1 = -3 ; x2 = 5
2. x1 = -1,4 ; x2 = 2