Réponse :

Explications étape par étape

Bonjour

Résoudre :

(5x - 1)(2x - 4) = 0

5x - 1 = 0 ou 2x - 4 = 0

5x = 1 ou 2x = 4

x = 1/5 ou x = 4/2 = 2

25x^2 - 9 = 0

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

5x - 3 = 0 ou 5x + 3 = 0

5x = 3 ou 5x = -3

x = 3/5 ou x = -3/5

4x^2 - 20x + 25 = 0

(2x)^2 - 2 * 2x * 5 + 5^2 = 0

(2x - 5)^2 = 0

2x - 5 = 0

2x = 5

x = 5/2

(x + 2)(x - 3) = x^2 + 6

x^2 - 3x + 2x - 6 = x^2 + 6

x^2 - x^2 - x = 6 + 6

-x = 12

x = -12