Bonjour,

exercice 24 :

A= 3(5-4x)

A = (3*5)-(3*4x)

A = 15-12x

B=-2(3y-8)

B = (-2*3y)+(2*8)

B= -6y + 16

C = -4(a+4)

C = -4a -16

D = x(3-x)

D= 3x-x²

E= t(2t +5)

E = 2t²+5t

F= 3y(y-2)

F= 3y² - 6

exercice 25 :

G = (x+7)(x+3)

G = x² + 3x + 7x +21

G = x² + 10x +21

H = (x-5)(x+2)

H = x² + 2x -5x -10

H = x² - 3x - 10

I = (2x+1)(x-4)

I = 2x² - 6x +x-4

I = 2x² - 5x - 4

J = (x-3)(3x-2)

J = 3x² - 2x -6x +6

J = 3x² -8x +6