bonjour pouvez vous m’aider svp à résoudre les équations sur la photo

Bonjour

Résoudre :

3x + 12 = 0

3x = -12

x = -12/3

x = -4

x/2 - 5 = 0

x/2 = 5

x = 5 * 2

x = 10

5x + 7 = 12

5x = 12 - 7

x = 5/5

x = 1

5x + 7 = x + 3

5x - x = 3 - 7

4x = (-4)

x = -4/4

x = (-1)

x^2 = 25

x^2 - 25 = 0

x^2 - 5^2 = 0

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

x - 5 = 0 ou x + 5 = 0

x = 5 ou x = -5

2x^2 - 98 = 0

2(x^2 - 49) = 0

x^2 - 7^2 = 0

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

x - 7 = 0 ou x + 7 = 0

x = 7 ou x = -7

(x - 3)(x + 5) = 0

x - 3 = 0 ou x + 5 = 0

x = 3 ou x = -5

Developper :

3(x - 4) = 3 * x - 3 * 4 = 3x - 12

x(2x + 6) = x * 2x + x * 6 = 2x^2 + 6x

4x(x^2 - 5x + 6) = 4x * x^2 - 4x * 5x + 4x * 6 = 4x^3 - 20x^2 + 24x