bonjour resoudre lequation a.3x=4 -x +4 b 2x – 7 =15+4x c. 2 (x-7) = 15 -4 x d. (2x +5) (x-7)=0 e. (x +5) (-x -7)=0 f. 3x ( x +4)=0

a)

3 x = 4 - x + 4

2x = 8

2x/2 = 8/2

x = 4

b)

2x - 7 = 15 + 4x

-22 = 2x

-22/2 = 2x/2

-11 = x

c)

2 (x-7) = 15-4x

2x - 14 = 15 -4x

6x = 29

6x/6 = 29/6

x = [tex]\frac{29}{6}[/tex]

d)

(2x+5)(x-7)=0

2x+5 = 0 ou x-7 = 0

2x = -5         x = 7

x = -5/2

e)

(x+5)(-x-7)=0

x+5 = 0 ou -x-7 = 0

x = -5 ou x = -7

f)

3x(x+4)=0

x = 0 ou x + 4 = 0

x = 0 ou x = -4