Réponse:
(3x-2)^2=(3x)^2-2×3x2+2^2=9x^2-12x+4
-(3x-2)(x+4)=-(3x^2+12x-2x-8)=-(3x^2+10x-8)=-3x^2-10x+8
9x^2-12x+4-3x^2-10x+8=6x^2-22x+12(form developpe)
forme facto:
(3x-2)[(3x-2)-(x+4)]
(3x-2)(3x-2-x-4)
(3x-2)(2x-6)
2(3x-2)(x-3)
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Réponse:
(3x-2)^2=(3x)^2-2×3x2+2^2=9x^2-12x+4
-(3x-2)(x+4)=-(3x^2+12x-2x-8)=-(3x^2+10x-8)=-3x^2-10x+8
9x^2-12x+4-3x^2-10x+8=6x^2-22x+12(form developpe)
forme facto:
(3x-2)[(3x-2)-(x+4)]
(3x-2)(3x-2-x-4)
(3x-2)(2x-6)
2(3x-2)(x-3)