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Victorgunda60
@Victorgunda60
May 2019
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DM de Mathématiques
Exercices 4
On donne L=(3x-2)²-(3x-2)(4+5x)
1) Développer et réduire L
2) Factoriser L
3) Résoudre (3x-2)(-2x-6)=0
Aidez moi svp Merci beaucoup de l'aide précieuses que vous m'apporterez
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nadiab
Développer
L=(3x-2)²-(3x-2)(4+5x)
L=(3x-2)(3x-2)
-(3x-2)(4+5x)
L= 9x²-6x-6x+4-(12x-8+15x²-10x)
L= 9x²-12x+4-15x²-2x+8
L= -6x²-14x+12
Factoriser L
L= (3x-2)[(3x-2)-(4+5x)]
L= (3x-2)(3x-2-4-5x)
L= (3x-2)(-2x-6)
Résoudre (3x-2)(-2x-6)=0
tu cherches la valeur x
S= {-3; 2/3}
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L=(3x-2)²-(3x-2)(4+5x)
L=(3x-2)(3x-2)-(3x-2)(4+5x)
L= 9x²-6x-6x+4-(12x-8+15x²-10x)
L= 9x²-12x+4-15x²-2x+8
L= -6x²-14x+12
Factoriser L
L= (3x-2)[(3x-2)-(4+5x)]
L= (3x-2)(3x-2-4-5x)
L= (3x-2)(-2x-6)
Résoudre (3x-2)(-2x-6)=0
tu cherches la valeur x
S= {-3; 2/3}