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Nightmarish
@Nightmarish
May 2019
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De l'aide ne serait pas de refus. Merci d'avance!
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slyz007
Verified answer
Bonjour
1)
18x²-24x+8+2(6-9x)(x-1)+9x²-4=2((3x)²-6x+2²)+2*3(2-3x)+(3x+2)(3x-2)
=2
(3x-2)
²-6
(3x-2)
(x-1)+
(3x-2)
(3x+2)
=(3x-2)[2(3x-2)-6(x-1)+(3x+2)]
=(3x-2)(6x-4-6x+6+3x+2)
=(3x-2)(3x+4)
2)
(x-3)²-(3x-1)²+(x-1)(2x-4)=(x-3+3x-1)(x-3-3x+1)+(x-1)(2x-4)
=(4x-4)(-2x-2)+2(x-1)(x-2)
=-8(x-1)(x+1)+2(x-1)(x-2)
=(x-1)[-8(x+1)+2(x-2)]
=(x-1)(-8x-8+2x-4)
=(x-1)(-6x-12)
=-6(x-1)(x+2)
3)
4x²-9+(2x-3)(x-1)+2x-3=(2x+3)(2x-3)+(2x-3)(x-1)+2x-3
=(2x-3)[(2x+3)+(x-1)+1]
=(2x-3)(3x+3)=3(2x-3)(x+1)
4) 3x³-2x²-3x+2=x²(3x-2)-(3x-2)
=(3x-2)(x²-1)=(3x-2)(x+1)(x-1)
5) (4x-3)²+(3-4x)(x-1)+(4-6x)(x-1)=(4x-3)²-(4x-3)(x-1)+(4-6x)(x-1)
=(4x-3)[(4x-3)-(x-1)]+(4-6x)(x-1)
=(4x-3)(3x-2)-2(3x-2)(x-1)
=(3x-2)[(4x-3)-2(x-1)]
=(3x-2)(2x-1)
6) 18(x-3)²-50(x-1)²=2[(3(x-3))²-(5(x-1))²]
=2(3x-9+5x-5)(3x-9-5x+5)
=2(8x-14)(-2x-4)
=-8(4x-7)(x+2)
7) (3x-4)²-(6x-8)(x-1)+9x²-16+10-4
=(3x-4)²-2(3x-4)(x-1)+(3x+4)(3x-4)+10x-4
=(3x-4)[(3x-4)-2(x-1)+(3x+4)]+10x-4
=(3x-4)(4x+2)+10x-4 : on ne peut pas factoriser plus
1 votes
Thanks 1
Nightmarish
Merci pour votre aide!
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Lista de comentários
Verified answer
Bonjour1)
18x²-24x+8+2(6-9x)(x-1)+9x²-4=2((3x)²-6x+2²)+2*3(2-3x)+(3x+2)(3x-2)
=2(3x-2)²-6(3x-2)(x-1)+(3x-2)(3x+2)
=(3x-2)[2(3x-2)-6(x-1)+(3x+2)]
=(3x-2)(6x-4-6x+6+3x+2)
=(3x-2)(3x+4)
2)
(x-3)²-(3x-1)²+(x-1)(2x-4)=(x-3+3x-1)(x-3-3x+1)+(x-1)(2x-4)
=(4x-4)(-2x-2)+2(x-1)(x-2)
=-8(x-1)(x+1)+2(x-1)(x-2)
=(x-1)[-8(x+1)+2(x-2)]
=(x-1)(-8x-8+2x-4)
=(x-1)(-6x-12)
=-6(x-1)(x+2)
3)
4x²-9+(2x-3)(x-1)+2x-3=(2x+3)(2x-3)+(2x-3)(x-1)+2x-3
=(2x-3)[(2x+3)+(x-1)+1]
=(2x-3)(3x+3)=3(2x-3)(x+1)
4) 3x³-2x²-3x+2=x²(3x-2)-(3x-2)
=(3x-2)(x²-1)=(3x-2)(x+1)(x-1)
5) (4x-3)²+(3-4x)(x-1)+(4-6x)(x-1)=(4x-3)²-(4x-3)(x-1)+(4-6x)(x-1)
=(4x-3)[(4x-3)-(x-1)]+(4-6x)(x-1)
=(4x-3)(3x-2)-2(3x-2)(x-1)
=(3x-2)[(4x-3)-2(x-1)]
=(3x-2)(2x-1)
6) 18(x-3)²-50(x-1)²=2[(3(x-3))²-(5(x-1))²]
=2(3x-9+5x-5)(3x-9-5x+5)
=2(8x-14)(-2x-4)
=-8(4x-7)(x+2)
7) (3x-4)²-(6x-8)(x-1)+9x²-16+10-4
=(3x-4)²-2(3x-4)(x-1)+(3x+4)(3x-4)+10x-4
=(3x-4)[(3x-4)-2(x-1)+(3x+4)]+10x-4
=(3x-4)(4x+2)+10x-4 : on ne peut pas factoriser plus