Résoudres les équations:
a) 3(2-3x)-(4+5x) =0
b)2(3x-1)+(5-x) (3x-1)=0
c)x aucarré-4x+4=0
d)4xaucarré=64
Bonjour,
résoudre les équations:
a) 3(2-3x)-(4+5x) =0
6 - 9x - 4 - 5x = 0
2 - 14x = 0
2 - 14x + 14x = 0 + 14x
2 = 14x
14x/14 = 2/14
x = 1/7
b)2(3x-1)+(5-x) (3x-1)=0
(3x - 1)(2 + 5 - x) = 0
(3x - 1)(7 - x) = 0
3x - 1 = 0 ou 7 - x = 0
3x = 1 ou x = 7
x = 1/3 ou x = 7
c)x^2-4x+4=0
x^2 - 2 * x * 2 + 2^2 = 0
(x - 2)^2 = 0
x - 2 = 0
x = 2
d)4x^2=64
4x^2 - 64 = 0
(2x)^2 - 8^2 = 0
(2x - 8)(2x + 8) = 0
2x - 8 = 0 ou 2x + 8 = 0
2x = 8 ou 2x = -8
x = 8/2 ou x = -8/2
x = 4 ou x = -4
