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Axelrommel26
@Axelrommel26
May 2019
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Bonjour, pouvez vous me faire ces deux équations, cela est pour demain ?? Ca m'aiderais également à mieux comprendre. Merci !
A = 3(2x-1) -4(x+1) = 7x-12-4(x-1) (les "x" il s'agit pas de fois mais de la lettre x)
B= (3x-1)(-2x+5) = (-2x+5)(x-4)
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maudmarine
Verified answer
Bonsoir,
A = 3(2x-1) -4(x+1) = 7x-12-4(x-1)
A = 6x - 3 - 4x + 1 = 7x - 12 - 4x + 4
A = 6x - 4x - 7x + 4x = - 12 + 4 + 3 - 1
A = - x = - 6
A = x = 6
B= (3x-1)(-2x+5) = (-2x+5)(x-4)
B = - 6x² + 15x + 2x - 5 = - 2x² + 8x + 5x - 20
B = - 6x² + 2x² + 15x + 2x - 8x - 5x - 5 + 20 = 0
B = - 4x² + 5x + 15
0 votes
Thanks 1
axelrommel26
Je n'ai pas compris le "+1" du premier calcul à la deuxième ligne car si on fait de la distributivité on obtient "-4*1 = -4" ?
1D2010
je crois qu'il y un problème concernant A
1D2010
Bonsoir,
3(2x-1) -4(x+1) = 7x-12-4(x-1)
6x-3-4x-4=7x-12-4x+4
2x-7=3x-8
-x=-1
x=1
S={1}
(3x-1)(-2x+5) = (-2x+5)(x-4)
(3x-1)(-2x+5) -(-2x+5)(x-4)=0
(-2x+5)[(3x-1)-(x-4)]=0
(-2x+5)(2x+3)=0
-2x+5=0 ou 2x+3=0
x=5/2 ou x=-3/2
S={5/2 ; -3/2}
Bonne journée !
1 votes
Thanks 1
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Lista de comentários
Verified answer
Bonsoir,A = 3(2x-1) -4(x+1) = 7x-12-4(x-1)
A = 6x - 3 - 4x + 1 = 7x - 12 - 4x + 4
A = 6x - 4x - 7x + 4x = - 12 + 4 + 3 - 1
A = - x = - 6
A = x = 6
B= (3x-1)(-2x+5) = (-2x+5)(x-4)
B = - 6x² + 15x + 2x - 5 = - 2x² + 8x + 5x - 20
B = - 6x² + 2x² + 15x + 2x - 8x - 5x - 5 + 20 = 0
B = - 4x² + 5x + 15
3(2x-1) -4(x+1) = 7x-12-4(x-1)
6x-3-4x-4=7x-12-4x+4
2x-7=3x-8
-x=-1
x=1
S={1}
(3x-1)(-2x+5) = (-2x+5)(x-4)
(3x-1)(-2x+5) -(-2x+5)(x-4)=0
(-2x+5)[(3x-1)-(x-4)]=0
(-2x+5)(2x+3)=0
-2x+5=0 ou 2x+3=0
x=5/2 ou x=-3/2
S={5/2 ; -3/2}
Bonne journée !