Bonjour jai besoin d'aide en math 3ème ​

Réponse :

Bonjour,

Explications étape par étape

A = 5+ (2x -7)(4-3x)

A = 5 + 8x - 6x^2-28+21x

A = -6x^2+29x-23

B = 3 - (4x+1)(-x+2)

B = 3 - (-4x^2+8x-x+2)

B = 3 + 4x^2-8x+x-2

B = 4x^2-7x+1

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

C = 5x-1+6x^2+2x-9x-3

C = 6x^2-2x-4

D = 4x^2-(-5x+2)(x-3)

D = 4x^2-(-5x^2+15x+2x-6)

D = 4x^2+5x^2-15x-2x+6

D = 9x^2-17x+6