Bonjour, je n’arrive pas la question 19 si vous pouvez m’aider. Merci beaucoup !

Réponse :

Bonjour,

2x + 3 = 5x - 2

2x + 3 - 3 = 5x - 2 - 3

2x = 5x - 5

2x - 5x = 5x - 5x - 5

-3x = -5

-3x / 3 = -5/(-3)

x = 5/3

(3x-1)² = 0

donc 3x - 1 = 0

3x = 1

x = 1/3

2x + 5/7 = 0

2x = -5/7

2x/x = -5/7*1/2

x = -5/14

x² - 2 = x² + 3x - x - 3

x² - 2 = x² + 2x - 3

-2 = 2x - 3

2x = -2 + 3

2x = 1

x = 0,5

Explications étape par étape

voila j'éspere que sa t'aura aider

Bonjour

a. 2x + 3 = 5x - 2

2x - 5x = - 2 - 3

- 3x = - 5

x = 5/3

b. (3x - 1)² = 0

3x - 1 = 0

3x = 1

x = 1/3

c. (2x + 5/7)² = 0

2x + 5/7 = 0

2x = - 5/7

14x = - 5

x = - 5/14

d. x² - 2 = (x - 1) (x + 3)

x² - 2 = x² + 3x - x - 3

x² - x² - 3x + x = 2 - 3

- 2x = - 1

x = 1/2.