bonsoir besoin d’aide svp

Bonjour

developper :

A = (2x + 3)^2 - (2x + 1)(2x - 1)

A = 4x^2 + 12x + 9 - (4x^2 - 1)

A = 4x^2 + 12x + 9 - 4x^2 + 1

A = 12x + 10

resoudre : A = 0

12x + 10 = 0

12x = -10

x = -10/12

x = -(2 * 5)/(2 * 6)

x = -5/6