Bonjour sil vous plait qui peut maider Mercii A= (2x+1)2 - (3x-2)(2x+1) Developper Factoriser Resoudre x=0 Resoudre x=3

Bonjour

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

Developper

A = 4x^2 + 4x + 1 - (6x^2 + 3x - 4x - 2)

A = 4x^2 + 4x + 1 - 6x^2 + x + 2

A = -2x^2 + 5x + 3

Factoriser

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

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

Resoudre x=0

(2x + 1)(-x + 3) = 0
2x + 1 = 0 ou -x + 3 = 0

2x = -1 ou x = 3

x = -1/2 ou x = 3

Resoudre x=3

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

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

-2x^2 + 5x = 0

x(-2x + 5) = 0

x = 0 ou -2x + 5 = 0

x = 0 ou 2x = 5

x = 0 ou x = 5/2