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2/ Factorise les expressions suivantes:
A= (x + 1)(x + 2) + (x + 1)(2x - 3)

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

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

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

Qui peut m’aider svp?

Sagot :

Bonsoir '

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

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

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

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

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

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

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

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

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

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

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

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

Bonne soirée.