Bonjour, vous pouvez m’aider ?

Bonjour,

5x = -3

x = -3/5

4x + 7 = -3x + 6

4x + 3x = 6 - 7

7x = -1

x = -1/7

(2x + 3)(x + 6) = 0

2x + 3 = 0

2x = -3

x = -3/2

et

x + 6 = 0

x = 0 - 6

x = - 6

x² = 125

x = [tex]\sqrt{125}[/tex] = 5[tex]\sqrt{5}[/tex]

8x + 3(x + 7) = 3(x + 2)

8x + 3x + 21 = 3x + 6

11x + 21 = 3x + 6

11x - 3x = 6 - 21

8x = -15

x = -15/8

Bonjour,

1)

5x=-3

x= -3/5

2)

4x+7 = -3x +6

4x +3x = 6-7

7x = -1

x = -1/7

3)

Soit

2x+3 = 0

2x= -3

x= -3/2

soit

x+6 = 0

x= -6

4

x²  = 125

x = √125

5)

8x +3x +21 = 3x +6

8x+3x-3x = 6-21

8x = -15

x = -15/8