Aidez-moi svp, c urgent c'est pour demain ! Merci (exercices 1 & 2)

Bonjour,

Exercice 1

A = (2x - 5) (3 - x)
A = 6x - 2x² - 15 + 5x
A = - 2x² + 6x + 5x - 15
A = - 2x² + 11x - 15

B = (3x - 4)²
B = 9x² - 24x + 16

C = (4x + 9) (4x - 9)
C = 16x² - 36x + 36x - 81
C = 16x² - 81

D = (- 3x + 4) (x + 2) + (5x + 1) (x - 2)
D = - 3x² - 6x + 4x + 8 + 5x² - 10x + x - 2
D = - 3x² + 5x² - 6x - 10x + 4x + x + 8 - 2
D = 1x² - 11x + 6

E = (8 + 5x)²
E = 64 + 80x + 25x²
E = 25x² + 80x + 64

F = (2x + 5) (- x + 2) - (x - 3) (- 3x + 4)
F = - 2x² + 4x - 5x + 10 - (- 3x² + 4x + 9x - 12)
F = - 2x² + 4x - 5x + 10 + 3x² - 4x - 9x + 12
F = - 2x² + 3x² + 4x - 4x - 5x - 9x + 10 + 12
F = x² - 14x + 22

Exercice 2
Tu le repostes