Answered

Bonjour, j'ai besoin d'aide SVP, merci.
Factoriser les expressions suivantes (classe de seconde):
A=(2x+3)(7x-1)-(7x-1)
B=64-4x²
C=(x+6)(-3x-1)-3x-18

Sagot :

PITOUILLE

Réponse :

Explications étape par étape :

A = (2x + 3)(7x - 1) - (7x - 1)

A = (7x - 1)((2x + 3) - 1)

A = (7x - 1)(2x - 2)

A = 2(7x - 1)(x - 1)

B = 64 - 4x² = (8 + 2x)(8 - 2x)

C=(x + 6)(-3x - 1) - 3x - 18

C = (x + 6)(-3x - 1) - 3(x + 6)

C = (x + 6)((-3x - 1) - 3)

C = - (x + 6)(3x + 4)

BRLVX

Bonjour,

A = (2x + 3)(7x - 1) - (7x - 1)

A = (7x - 1)((2x + 3) - 1)

A = (7x - 1)(2x + 2)

A = 2(7x - 1)(x + 1)

B = 64 - 4x²

B = (8 - 2x)(8 + 2x)          (identité remarquable)

C = (x + 6)(-3x - 1) -3x - 18

C = (x + 6)(-3x - 1) - 3(x + 6)

C = (x + 6)((-3x - 1) - 3)

C = (x + 6)(-3x - 4)

C = - (x + 6)(3x + 4)