aidez moi svp dans c est deux exercice merci d avance

Bonjour !

Exercice 2 :

A = (5x + 2)(6x + 4)

A = 5x*6x + 2*6x + 5x*4 + 2*4

A = 30x² + 12x + 20x + 8

A = 30x² + 32x + 8

B = (-5x - 3)(-4x - 2)

B = -5x*(-4x) - 3*(-4x) - 5x*(-2) - 3*(-2)

B = 20x² + 12x + 10x + 6

B = 20x² + 22x + 6

C = (2x - 5)(-5x + 3)

C = 2x*(-5x) - 5*(-5x) + 2x*3 - 5*3

C = -10x² + 25x + 6x - 15

C = -10x² + 31x - 15

D = (-4 + 3x)(3 - 2x)

D = -4*3 + 3x*3 - 4*(-2x) + 3x*(-2x)

D = -12 + 9x + 8x - 6x²

D = -6x² + 17x - 12

E = (-5x + 2)(5 + 4x)

E = -5x*5 + 2*5 - 5x*4x + 2*4x

E = -25x + 10 - 20x² + 8x

E = -20x² - 17x + 10

F = (3 - 2x)(5 - 6x)

F = 3*5 - 2x*5 + 3*(-6x) - 2x*(-6x)

F = 15 - 10x - 18x + 12x²

F = 12x² - 28x + 15

G = (-8x + 5)(-2x + 4)

G = -8x * (-2x) + 5*(-2x) - 8x*4 + 5*4

G = 16x² - 10x - 32x + 20

G = 16x² - 42x + 20

H = (-4 + 3x)(5x - 2)

H = -4*5x + 3x*5x - 4*(-2) + 3x*(-2)

H = -20x + 15x² + 8 - 6x

H = 15x² - 26x + 8

I = (5x + 2)²

I = (5x)² + 2*5x*2 + 2²

I = 25x² + 20x + 4

J = (7x - 3)²

J = (7x)² - 2*7x*3 + 3²

J = 49x² - 42x + 9

Exercice 3 :

A = 5x - xy

A = 5*x - x*y

A = x(5 - y)

B = a² + 3ab

B = a*a + 3b*a

B = a(a + 3b)

C = 12a - 12ab

C = 12a*1 - 12a*b

C = 12a(1 - b)

D = 60x³ - 24x⁵ + 36x²

D = 12x² * 5x - 12x² * 2x³ + 12x² * 3

D = 12x²(5x - 2x³ + 3)

E = 7x² - 28x⁴ + 70x³

E = 7x² * 1 - 7x² * 4x² + 7x² * 10x

E = 7x²(1 - 4x² + 10x)

F = 3(2 + x) + (2 + x) * y

F = (2 + x)(3 + y)

G = (x - 3) + 2x(x - 3)

G = 1 * (x - 3) + 2x(x - 3)

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

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

H = (5x + 2y) [(5 + x) + 2}

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

H = (5x + 2y)(7 + x)

J'espère t'avoir aidé. Bon courage !