Bonsoir,
g) 5x-10 = 2x+2.
5x - 2x = 2 + 10
3x = 12
x = 12/3
x = 4
h) 2(x+8)+3=4-3x.
2x + 16 + 3 = 4 - 3x
2x + 3x = 4 - 16 - 3
5x = - 15
x = - 15/5
x = - 3
i).(4-5x)(x+2)=0.
4 - 5x = 0 ou x + 2 = 0
- 5x = - 4 x = - 2
x = 4/5
j) 9x²+36x+36=0
9 (x + 2)² = 0
x + 2 = 0
x = - 2
k). 64-x²=0
- (x - 8) = 0 ou x + 8 = 0
- x + 8 = 0 x = - 8
- x = - 8
x = 8
l) (x-7)(-2+5x)-(x-7)(3x+5)=0
(x - 7) (- 2 + 5x - 5 - 3x)
(x - 7) (2x - 7) = 0
x - 7 = 0 ou 2x - 7 = 0
x = 7 2x = 7
x = 7/2.
