3) (3x - 7)(2x + 5) = 0
3x - 7 = 0 ⇒ 3x = 7 ⇒x = 7/3
ou 2x + 5 = 0 ⇒ 2x = - 5 ⇒ x = -5/2
4) 6x² - 18x = 0
6x(x - 3) = 0
6x = 0 ⇒x = 0
ou x - 3 = 0 ⇒ x = 3
5) x² - 9 = 0
x² - 3² = (x - 3)(x + 3) = 0
x - 3 = 0 ⇒x = 3
ou x + 3 = 0 ⇒x = - 3
Copyright © 2024 ELIBRARY.TIPS - All rights reserved.
Lista de comentários
3) (3x - 7)(2x + 5) = 0
3x - 7 = 0 ⇒ 3x = 7 ⇒x = 7/3
ou 2x + 5 = 0 ⇒ 2x = - 5 ⇒ x = -5/2
4) 6x² - 18x = 0
6x(x - 3) = 0
6x = 0 ⇒x = 0
ou x - 3 = 0 ⇒ x = 3
5) x² - 9 = 0
x² - 3² = (x - 3)(x + 3) = 0
x - 3 = 0 ⇒x = 3
ou x + 3 = 0 ⇒x = - 3
Verified answer
Bonsoir,1. 5x -3 = 6-3x
5x + 3x = 6+3
8x = 9
x = 9
---
8
2. 3(5-2x) = 7-4x
15 -6x = 7-4x
-6x+4x = 7-15
-2x = -8
x= -8
----
-2
x= 4
Désolé je n'ai pas compris le 3, 4 et 5