Réponse :
(4x² - 24x + 36 = 0 => (2x - 6)² = 0 => 2x - 6 = 0 => x = 3
-5x² + 30x = 0 => -5x(x-6) = 0 => -5x = 0 => x = 0 ou x-6 = 0 => x = 6
(2x-1)(2x+1) = 0 => 2x-1 = 0 => x = 1/2 ou 2x+1 = 0 => x = -1/2
(3x+5)² = 81 => 3x+5 = -9 => 3x = -14 => x = -14/3
ou 3x + 5 = 9 => 3x = 4 => x = 4/3
Bonne soirée
Explications étape par étape
