Bonjour, j'aurais besoin d'aide pour l'exercice suivant

Réponse :

Explications étape par étape

Bonsoir

Factoriser et développer (comme tu n’es pas sur de ton énoncé !!!!

A = (2x + 5)(7 - 3x)

A = 14x - 6x^2 + 35 - 15x

A = -6x^2 - x + 35

B = (2x + 3)(4 - x + 7x)

B = (2x + 3)(6x + 4)

B = 2(2x + 3)(3x + 2)

B = 12x^2 + 8x + 18x + 12

B = 12x^2 + 26x + 12

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

C = x(3x - 9)

C = 3x(x - 3)

C = 3x^2 - 9x

D = (3x - 1)(2x + 5 - 3x + 8)

D = (3x - 1)(-x + 13)

D = -3x^2 + 39x + x - 13

D = -3x^2 + 40x - 13

E = (8x - 9)(5x - 3 + 2x + 1)

E = (8x - 9)(7x - 2)

E = 56x^2 - 16x - 63x + 18

E = 56x^2 - 79x + 18

F = (x + 7)(5x - 1 - x + 7)

F = (x + 7)(4x + 6)

F = 2(x + 7)(2x + 3)

F = 4x^2 + 6x + 28x + 42

F = 4x^2 + 34x + 42

G = (x - 3)(4x - 1 - 4x - 5)

G = (x - 3)(-6)

G = -6(x - 3)

G = -6x + 18

H = (5x - 1)(3x - 2 - 3x + 5)

H = (5x - 1)(3)

H = 3(5x - 1)

H = 15x - 3

I = (7x + 5)(3x - 2 + 2x - 3)

I = (7x + 5)(5x - 5)

I = 5(7x + 5)(x - 1)

I = 35x^2 - 35x + 25x - 25

I = 35x^2 - 10x - 25

J = (4x - 5)(x - 3 - 3x - 1)

J = (4x - 5)(-2x - 4)

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

J = -8x^2 - 16x + 10x + 20

J = -8x^2 - 6x + 20