bonjour pouvez-vous m'aider à résoudre ces équations ? A) (3x - 9) (2x - 8) = 0 B) ( 4x - 12 ) ( 5 - 2x ) = 0 C) ( 3x + 6 ) ( 9 + 2x ) = 0 D) x ( 7 + 7x) = 0 E)
Mathématiques
jjustine
Question
bonjour
pouvez-vous m'aider à résoudre ces équations ?
A) (3x - 9) (2x - 8) = 0
B) ( 4x - 12 ) ( 5 - 2x ) = 0
C) ( 3x + 6 ) ( 9 + 2x ) = 0
D) x ( 7 + 7x) = 0
E) 2x ( 6 + 9x ) = 0
a) x ( 2x - 8 ) = 0
b) ( 3x - 12 )au carré = 0
c) 3x ( - x + 5 ) = 0
d) 4x ( x - 2 ) = 0
pouvez-vous m'aider à résoudre ces équations ?
A) (3x - 9) (2x - 8) = 0
B) ( 4x - 12 ) ( 5 - 2x ) = 0
C) ( 3x + 6 ) ( 9 + 2x ) = 0
D) x ( 7 + 7x) = 0
E) 2x ( 6 + 9x ) = 0
a) x ( 2x - 8 ) = 0
b) ( 3x - 12 )au carré = 0
c) 3x ( - x + 5 ) = 0
d) 4x ( x - 2 ) = 0
1 Réponse
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1. Réponse maudmarine
Bonsoir,
A) (3x - 9) (2x - 8) = 0
3x - 9 = 0 ou 2x - 8 = 0
3x = 9 2x = 8
x = 9/3 x = 8/2
x = 3 x = 4
B) ( 4x - 12 ) ( 5 - 2x ) = 0
4x - 12 = 0 ou 5 - 2x = 0
4x = 12 - 2x = - 5
x = 12/4 x = 5/2
x = 3 x = 2,5
C) ( 3x + 6 ) ( 9 + 2x ) = 0
3x + 6 = 0 ou 9 + 2x = 0
3x = - 6 2x = - 9
x = - 6/3 x = - 9/2
x = - 2 x = - 4,5
D) x ( 7 + 7x) = 0
x = 0 ou 7 + 7x = 0
7x = - 7
x = - 7/7
x = - 1
E) 2x ( 6 + 9x ) = 0
2x = 0 ou 6 + 9x = 0
x = 0 9x = - 6
x = - 6/9
x = - 2/3
a) x ( 2x - 8 ) = 0
x = 0 ou 2x - 8 = 0
2x = 8
x = 8/2
x = 4
b) ( 3x - 12 )² = 0
(3x - 12) (3x - 12) = 0
3x - 12 = 0
3x = 12
x = 12/3
x = 4
c) 3x ( - x + 5 ) = 0
3x = 0 ou - x + 5 = 0
x = 0 - x = - 5
x = 5
d) 4x ( x - 2 ) = 0
4x = 0 ou x - 2 = 0
x = 0 x = 2