bonjour je suis bloquer sur ses questions. merci d’avance. factoriser et réduire F= (-5x + 1)(8 – x) + 4(-5x +1) G = (2x + 3) – (5 + x)(2x + 3) H = 81x2 – 18x I

Bonjour,

F = (-5x + 1)(8 - x) + 4(-5x + 1)

F = (-5x + 1)(8 - x + 4)

F = (-5x + 1)(12 - x)

G = (2x + 3) – (5 + x)(2x + 3)

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

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

H = 81x² – 18x

H = 9x(9x - 2)

I = (6x – 1)(x + 2) - (5 – 3x)(x + 2)

I = (x + 2)(6x - 1 - 5 + 3x)

I = (x + 2)(9x - 6)

Réponse :

Bonjour

F= (-5x + 1)(8 – x) + 4(-5x +1)=(-5x+1)(8-x+4)=(-5x+1)(12-x)

G = (2x + 3) – (5 + x)(2x + 3)=(2x+3)(1-5-x)=(2x+3)(-4-x)

H = 81x2 – 18x=162-18x=9(18-2x)

I = (6x – 1)(x + 2) - (5 – 3x)(x + 2)=(x+2)(6x-1-5+3x)=(x+2)(9x-6)=3(x+2)(3x-2)

Bonne journée